Nintendo hasn't even come close to playing any of their big cards yet either.
The Wii hasn't gotten a proper Zelda game (Twilight Princess was a GameCube game), a new Donkey Kong platformer on the Wii could be just as big as DKC was on the SNES, there's Pikmin 3, Star Fox used to be a huge franchise before Nintendo farmed it out, it could be again on the Wii. And there's much better third party support on the horizon.
Not to mention, they could just drop the price by $50 every year from here on out until Wii 2 ...
2009 - $199.99
2010 - $149.99
2011 - $99.99
fall 2011/2012 - Wii 2
That's *if* they feel the need to.







