It's funny, because earlier on, someone used people requesting Kinect as a straw-man argument against casual players.

But really, Kinect would be massively unwieldy in a free roaming roleplay game. If the developers were determined to use it (which I doubt, seeing as it pretty much eliminates cross-platform compatibility), I'd guess that they could put it in a minigame... Or something. Maybe an arena style match, where you actually control your character's fighting style. That was just the reasonable reply anyway, instead of the inevitable backlash the idea is probably going to get. (Braces for flaming).
Personally, I'm against the idea. But if you think you can sell the concept to everyone, go for it.