Kinect, Wii Remote, PlayStation Move, there is a definitive trend towards console games being controlled with some sort of device that tracks the motion of your body, instead of just being controlled with the fingers. But I'm not buying any of these, after having tried out both the PS2 EyeToy and the Wiimote. Very simple reason: I like play sessions that last several hours. Technically I'm not a couch-potato (I mostly play PC games sitting in an office chair, not a couch), but a full body control game is a lot more strenuous than either a gamepad or a mouse/keyboard control scheme.
For exactly this reason I don't think that this sort of controller has any future for MMORPGs. The amount of hours people want to play a MMORPG for per week largely surpasses the amount of hours they'd like to work out. I think these full body control schemes are great for casual games, and have a potential to get people to play who think gamepads are too complicated. But they aren't the future of gaming.