However, for many applications including the aforementioned Yoga and Tai Chi, and many exercises where a user could incorporate weights into the regime there could be an excellent training benefit by using depth tracking hardware to confirm that your mechanics are correct. Further, for applications like a golf swing analysis, batter's swing, and pitcher's throw, where you can actually hold onto the real device, the potential benefits are obvious in terms of relating your motion to the ideal.

It looks like we are going to get to see what people do with it, since the rumor mill has it that there is a confirmed product release for depth on a console for fall 2009.

Forget the part about the AI being a good enough teacher for a moment. The simulation isn't physically sufficient. It's fine for toys and party games, and it might even work for solo exercises like yoga, but anything that requires interacting with any real, weighted object and/or another human being cannot be taught with this control scheme.

Nobody will ever be able to learn what it is to fire a rifle, use a firehose to douse a burning building, hit a heavy bag, or escape from an arm-bar with a system like this. Sorry, but the system simply cannot do it.

You'll have to forgive me for the title. Creative license, etc.