It's gonna keep selling. People don't buy MKWii because they love mario: they buy it because they've played Wii Sports to death and want a new experience, and there's this other game with a crazy wheel that you move just like a real steering wheel! (Which is the same 'reality' technique that made Wii Sports so successful).
Interesting note: According to VGCharts, last week MKWii sold 163K world wide, higher than GTA4 for PS3 and 360 combined. (39K and 35K respectively.) It's already outsold the both versions individually world wide. This is the true power of nintendos strategy. It's not selling awful 'casual' games to non-traditional gamers, but slowly moving those non-traditional gamers upmarket to more and more sophisticated games, selling all the while.
Edit: I need to write quicker. Every time I reply to something, by the time I'm actually done writing there's new posts!
Wii has more 20 million sellers than PS3 has 5 million sellers.
Acolyte of Disruption
