I dont recall saying that these device would imitate a real punch or the real training.
Not even with all these gadgets that i have suggested.... im sure that applications (not direct game entertainment as we knew it) but a new breed of applications ie. sing star, eye toy and now the multi-touch panel all next-gen (game related sometimes) technologies which are going to bring a new type of entertainment to the public. sensor detecting seems to be "the present" and the technology is only going to get better in RevolutionNext, and the other next next-gen systems. What i am describing could be apart of a near-future online fighting style gaming with REAL moves from martial arts etc.
I think nintendo probably has a lead on this concept (maybe, i could be wrong)