In my humble opinion.
Also, before I begin, this is outside of any really great new design ideas that work well: because that can be said about any franchise.
1. Metroid - This one has a rabbid fanbase, some people here are probably a part of it, but I think the main attraction to this franchise is based on the idea that Gamecube got a mature title, and less about the actual game itself. The rest of the attraction is the fact that the early Metroid games do indeed kick ass. I played through the NES Metroid recently, and was surprised at how much I enjoyed it (much more than Super Metroid and other later 2D Metroid titles). I am also a big fan of Metroid 2, and I hope the remake gets an enhanced port to Switch despite how beautiful I imagine it looks in 3D. I think the sort of Metroid game I want, and the sort of Metroid game the Prime fans want are of small appeal, and that is why this franchise can never sell well without a major overhaul to the point that only resemblance is a skin deep. They COULD make a new Metroid game along the lines of Mass Effect, it could sell great, and prove me wrong: but let's be real, a Mass Effect quality game wouldn't need the Metroid franchise to be successful... and vastly revamping any franchise and making it good can be done.
Actually, if I were to design a Metroid game for me, it would be 8-bit style like Metroid 1 (perhaps with a Shovel-Knight-esque facelift). It would take place across multiple planets (like Hunters) with ship upgrades allowing for travel to different locations. A hub, similar to Hollow Knight, that grows as the player completes objectives. Colonies of allies within the planets (different from other Metroid games), or people/scientists to rescue for the purpose of expanding the hub. To me, something like that would be interesting. Or a straight-up Metroid 1 clone... Axiom Verge sort of covers that.
2. F-Zero - The time of futuristic racers has come and gone. I find the persistent fanbase of this genre bewildering. Especially since they're rarely satisfied by ANYTHING released in the genre since around 2002.
3. Star Fox - If Nintendo was making high-end hardware, this is a GREAT franchise to show that off. That time is in the past. Play Star Fox 64 and tell me how long before you're bored, I'm willing to bet many NES games stay interesting longer than this one. This one's fanbase also bewilders me, people were genuinely upset about the injustice done with Star Fox Zero... which was the closest to Star Fox 64 of any of the games. IMO, this franchise is out of date. Like Rogue Leader, it's only interesting when the graphics look better than most other games. This franchise has had numerous attempts at re-envisioning, and they all failed.
4. Kirby. And it hurts me to say it because this is one of my favourite platformer franchises of the early-mid 1990s. Without Iwata at the helm, I feel this franchise is not going to go in the right direction; he always ensured the right game for the right time and hardware. There was something very different feeling about the Switch title. Objectively it was a fine game, but it didn't feel like the right time or hardware for that sort of game... and frankly, I think the new Yoshi game looks dozens of times more interesting. I only see this game's legacy being done poorly going forward.
5. Pikmin. On paper, this game sounds like something I'd really dig. The Will Wright game that inspired it, Sim Ant, was one of my favourite games on SNES. Perhaps it's just the level-based gameplay of it, but I never found it too interesting. Little King's Story released on Wii and Vita was much more interesting to me. I think if Nintendo wants to make a franchise based on the Pikmin concept, they should look into co-developing Little King's Story Switch with Marvelous, rather than trying to make Pikmin work again. Again, this is one of those game franchises where it has a fanbase that likes it because it was on Gamecube, and generally like the idea of the game more than the game itself.
If it's not clear, I find a lot of the Gamecube fans to be a little cult-like. They're still defensive of the machine as though still fighting a system war against PS2. Either that or they genuinely forget how miserable that generation actually was for Nintendo fans; or might not be old enough to remember. A couple of years later a growing contingent of Nintendo fans has begun arguing that the Wii U was actually a lot better than the Switch - if this was two years ago, such a thought would be insane: similar to Gamecube (in regards to the Wii), many looked upon the Switch as a betrayal to Wii U fans... but also similar to the Wii/Gamecube, that whole thing began with concern trolling from anti-Nintendo fans - I am baffled by how effective that tactic is =P
Also, before I begin, this is outside of any really great new design ideas that work well: because that can be said about any franchise.
1. Metroid - This one has a rabbid fanbase, some people here are probably a part of it, but I think the main attraction to this franchise is based on the idea that Gamecube got a mature title, and less about the actual game itself. The rest of the attraction is the fact that the early Metroid games do indeed kick ass. I played through the NES Metroid recently, and was surprised at how much I enjoyed it (much more than Super Metroid and other later 2D Metroid titles). I am also a big fan of Metroid 2, and I hope the remake gets an enhanced port to Switch despite how beautiful I imagine it looks in 3D. I think the sort of Metroid game I want, and the sort of Metroid game the Prime fans want are of small appeal, and that is why this franchise can never sell well without a major overhaul to the point that only resemblance is a skin deep. They COULD make a new Metroid game along the lines of Mass Effect, it could sell great, and prove me wrong: but let's be real, a Mass Effect quality game wouldn't need the Metroid franchise to be successful... and vastly revamping any franchise and making it good can be done.
Actually, if I were to design a Metroid game for me, it would be 8-bit style like Metroid 1 (perhaps with a Shovel-Knight-esque facelift). It would take place across multiple planets (like Hunters) with ship upgrades allowing for travel to different locations. A hub, similar to Hollow Knight, that grows as the player completes objectives. Colonies of allies within the planets (different from other Metroid games), or people/scientists to rescue for the purpose of expanding the hub. To me, something like that would be interesting. Or a straight-up Metroid 1 clone... Axiom Verge sort of covers that.
2. F-Zero - The time of futuristic racers has come and gone. I find the persistent fanbase of this genre bewildering. Especially since they're rarely satisfied by ANYTHING released in the genre since around 2002.
3. Star Fox - If Nintendo was making high-end hardware, this is a GREAT franchise to show that off. That time is in the past. Play Star Fox 64 and tell me how long before you're bored, I'm willing to bet many NES games stay interesting longer than this one. This one's fanbase also bewilders me, people were genuinely upset about the injustice done with Star Fox Zero... which was the closest to Star Fox 64 of any of the games. IMO, this franchise is out of date. Like Rogue Leader, it's only interesting when the graphics look better than most other games. This franchise has had numerous attempts at re-envisioning, and they all failed.
4. Kirby. And it hurts me to say it because this is one of my favourite platformer franchises of the early-mid 1990s. Without Iwata at the helm, I feel this franchise is not going to go in the right direction; he always ensured the right game for the right time and hardware. There was something very different feeling about the Switch title. Objectively it was a fine game, but it didn't feel like the right time or hardware for that sort of game... and frankly, I think the new Yoshi game looks dozens of times more interesting. I only see this game's legacy being done poorly going forward.
5. Pikmin. On paper, this game sounds like something I'd really dig. The Will Wright game that inspired it, Sim Ant, was one of my favourite games on SNES. Perhaps it's just the level-based gameplay of it, but I never found it too interesting. Little King's Story released on Wii and Vita was much more interesting to me. I think if Nintendo wants to make a franchise based on the Pikmin concept, they should look into co-developing Little King's Story Switch with Marvelous, rather than trying to make Pikmin work again. Again, this is one of those game franchises where it has a fanbase that likes it because it was on Gamecube, and generally like the idea of the game more than the game itself.
If it's not clear, I find a lot of the Gamecube fans to be a little cult-like. They're still defensive of the machine as though still fighting a system war against PS2. Either that or they genuinely forget how miserable that generation actually was for Nintendo fans; or might not be old enough to remember. A couple of years later a growing contingent of Nintendo fans has begun arguing that the Wii U was actually a lot better than the Switch - if this was two years ago, such a thought would be insane: similar to Gamecube (in regards to the Wii), many looked upon the Switch as a betrayal to Wii U fans... but also similar to the Wii/Gamecube, that whole thing began with concern trolling from anti-Nintendo fans - I am baffled by how effective that tactic is =P