Thing is, it will sell well. It will sell ridiculously well. For two major reasons.
A) It's Nintendo. So the fans are going to snap it up and have a blast with it, despite all logic otherwise. Especially in Japan.
B) Mario and Monster Hunter, and to lesser degree Zelda (Although Skyward Sword was a rather large sales disappointment for them apparently), as long as Nintendo has two major franchises, which are HUGE in Japan, they will do quite well.
And worse, they really don't care outside of that. Japan is their playground, and to a lesser degree Europe, anything the West gets will be begrudging and likely years after they get it. Because to Nintendo, we're not 'worthy' of their products. After all, it's all about First Person Shooters and other garbage games, while they, the Big N, make 'quality' games.