I bet if given the option most would buy a Kinectless version of the Xbone.
Sony sees that people might not want it so they sold it seperately.
Hopefully the PS4 is easier to develop for so companies won't have to port games over. But in all honesty the only games to get the best out of each system are the exclusives as they are designed for each respective console.
Mass games have to be built to work on both thus will have to cut corners to work on both
We need more exclusives and not COOP releases.