Before anyone says "ah Kinect.. lol" ; "Kinect ruins gaming" blablablabla...
First, Sony has more game studios than Microsoft. Because Playstation 4 is more powerful, has more video game developers support, then Sony should re-create Sony PS eye and create Kinect.
PS Move was just confusing. Having Kinect on PS4 could work very well. I mean Sony has better hardware team who can make Kinect more accurate with same price, plus you can have games that not having any lag or anything like that. This would boosts PS4 sell.
Having Kinect on PS4 DOES NOT CHANGE SONY PRIORITY AND MAKING ALL KINECT GAMES. NO, KINECT IS JUST EXTRA.
The thing is, PS4 outselling Xbox One and Kinect is dead on Microsoft side. Sony meanwhile sells PS4 crazy and why not steal Kinect, make it better and have profit? Sony don´t have to even force game developers make Kinect games. When you already outselling Xbox One and Wii U, then having PS Eye stronger than Microsoft Kinect can make Sony monopoly.
It can totally work.