I've been 2 months behind all of the articles for sometime, so forgive the late response as I'm just now catching up.
I would like to point out that if you read Wii forums on the exercise games, that many people are CRYING out for a controllerless way to exercise with something interactive like the Wii. The Xbox 360's Kinect will do exactly that. If the software is programmed competently so that the motion is recorded accurately, the Xbox may have a HUGE hit with those of us attempting to use such devices for weight loss or simply an entertaining way to exercise.
In my opinion, the only exercise games on the Wii that even comes close to recording your movements while giving you a great workout is the EA Sports series. The only reason why those particular games come close is because they attach the Nunchuck controller to one of your thighs so that it can increase the accuracy via a manual hack if you will. The attachment device eventually starts to rip and you have to buy another one. That's the best exercise series the Wii has to offer - a series that forces you to continually purchase a strap because it rips.
Believe me when I say the Xbox 360 has a great chance of ripping the exercise market away from the Wii.