"if good games that implement the wii board come out (snowboarding game?) come out, that would help it sales wise. "
I do not think that a snowboarding game would be a good match for the board as it is too small for you to get your feet in a proper snowboarding position.
However if there was a snowboarding game supporting dual wii fit boards as an extra it could be cool.
Also, while I think Wii Fit will be a success I really cannot see how you can do Yoga on this thing outside of a few standing Asanas and maybe headstand/shoulderstand (if you can get in the postition on the board for the latter).
Doesn't matter anyway, as I prefer doing Yoga in class (last class, about 20 women with half of them in their 20's and quite a few of those pretty with a couple stunners and me as the only male student, nice).