FAD!
Look at the Wii's best games (Mario Galaxy, Twilight Princess, MEtroid Prime 3, No More Heroes), was there really anything that couldn't have been done using a GameCube controller?
Aside from a few party games motion controls essentially a useless innovation, I suspect (and hope) that Sony and Microsoft's efforts die an embarresing death. Besides, motion controllers offer no physical feedback, making them largely useless for things like shooters (remember playing CoD 3 on the Wii?).