I've thought that too, but how would you generalize the motion to move forward, or backwards? I can see the charging up part making sense but not general momentum. Besides that'd be a hellava workout on the forearms with the wiimote and nunchuck. Same for the kinect, having to oscillate hand motion to gesture your forward and backward intentions.
Maybe I'm startin to see why...but like I said, there's still the classic controllers.
And damnit...I miss those games