Kinect isn't only for changing channel, the point is to collect audience data. Think about it: Kinect knows who's in front of the screen, their gender and approximate age (maybe even their race), who's awake, who's shuffling and bored, who leaves the room and at which point in whatever it is they're watching. If MS know who's signal is going through the box then there's a lot of valuable audience response data that production companies currently pay to research right there. If MS goes into production a la Netflix they'll have a lot of big data on tap to guide their commissioning. MS won't need to bother with focus groups any more.