I feel the same way as you except I really, really want the Kinect to fail miserably. Not so miserably that MS exits the console business, but badly enough that they completely give up on motion control. I fear that what you are afraid of (Kinect being required for too many games) will happen if it doesn't fail.
Yea, I just don't want the companies to become segmented and produce half-assed games. I mean, if you like motion control gaming...great! Now go buy a wii, since that's what they do best. Now, every console company wants a piece of that pie. That pisses me off since they should be focusing on what they do best, and not just make rip-offs of wii games.
I mean, at the price points available, why would anyone choose the kinect over the wii (right now)? At $200 the wii is all included and has a library of titles spanning a couple of years.
The way kinect is shaping up is to be an experiment for MS's next console in the same way Xbox Live and Live arcade was. They both existed on the original xbox but weren't embraced like they are with the 360.