I think it is going to be awesome. Unlike the wii you dont need a control, you are the control, it is for the xbox so unlike the wii, it wont just be for 10 year olds and as it is for the xbox, unlike the wii, it will have good graphics, good sound and good gameplay.
Also, when i play my xbox i am either playing for fun, or to relax. If it is tto relax, i can sit and play with my remote, if i want some fun, i can play with natal. If i want to relax AND have fun, as we have seen with Milo, you don't need to be jumping around all the time to play, yea there are things that you can get up and do, but you don't have to be walking around.
And even if you think it won't take off, you have to appreciate how amazing this is, to be able to play without a remote with something that recognises your face, your voice, your movements, your mood, everything, it is totally revolutionary and astounding how you could 1. engineer something like that and 2. program stuff like that, I find it mind boggling myself