Look, it's a Nintendo system. Nintendo will do weird shit, and it'll have the Nintendo games you care about, you'll buy it, you'll enjoy it, and you'll shut up!
You CANNOT predict Nintendo.
3rd party support will probably be ports for the first year, and a year after that it'll get the big releases at the same time as on 360/PS3. At year after that though Microsoft/Sony should announce their successor consoles(Their words, 2 years before announce, 2 more years before PS3/360 die, 4 years total for 10 year life span).
I think the best thing the PS3 did for the next at least 2 generations is show them not to put out stupidly priced systems($500+) and expect people to buy them.
My question to the world is will the PS4 & X-Box whatever be backwards compatible? Will we get those PS2 classics eventually like we got PS1, and would such a feature hike up the price of the system.
The reason I ask this is because moving forward, I don't think its really possible for games that are really old to exist outside of "the cloud" in the future. There are a crap ton of PS2 classics out there that would probably sell like hot cakes on the PS Store, and eventually the PS3 games we're playing now will be impossible to find. It just occurs to me going forward that our game systems will have to be backwards compatible to some degree or we'll be losing out on alot of old classics.
It's not like the PC where you can find just about anything since MS Dos, console games are alot harder to dig up, and deteriorating conditions are a concern as well.