I don't think motion controls are as completely useless as a lot of people seem to, but there is no way you could effectively control a good RPG with them, it's annoying enough using a controller instead of a keyboard, and it's an equally horrible idea to attempt to toss some MCEs (Motion Control Events) in for random things like shoving a guy out the window. Switching control methods would completely shatter immersion. Some simple shooters and sword fighting games could make great use of them, but nothing in need of complicated controls.