The trend towards "casual gaming" is disturbing, to say the least. Companies have discovered that they make far more money with less effort by making causal games, and the amount of quality games is slowly declining in favor of XBLA and Popcap and the like.
I may get a Natal thinger to see if I can make it work with my computer. MS got Johnny Woo on that project, and after seeing what he did with the Wiimote, I've got my fingers crossed that he's slipping in some PC-friendly design.