WOW... Shaun White really tanked this year.
The Wii audience is very 'fadish'. You have to grab them with something interesting but then do something completely different the next year. Yearly sequels just don't work well on Wii. People will just buy the older, cheaper title. And what was novel once, isn't a second time.
Surprised no one really used WM+ (except EA) to sell games.
You don't see Nintendo coming out with SMG2, Zelda Wii 2, Metroid Wii 2, Endless Ocean 2... oh... snap.
But seriously, it'll work fine with the Nintendo core but not the casuals. NSMBW & Mario Kart should never get a sequel this gen.