1. Kinect is not eyetoy. The technologies are very different. In-fact, ANY webcam can become an eyetoy with a little software (software dell includes default with all laptops that have an onboard camera). Kinect uses different technologies entirely. The eyetoy was a motion sensor, Kinect is not.
2. Kinect is not the next revolution in gaming. It just isn't.
3. Much like Wii, entertainment value will deplete.
4. You will never see actual gamers legitimately using Kinect. Much like Wii, Kinect is marketed at people who don't typically play videogames, and that's the only group of people it will stay popular with. It's more of a gimmick than anything.
also "whoa voice controls". That's a dumb reason to hail this as amazing technology.