The company behind Kinect went first to Nintendo presenting their camera, Nintendo literally said: "Too expensive. Not practical. It doesn't deliver what you guys say. Wiimote gives better results. We don't want it. The door out is right there buddy. Kthxbai."
Then they went to Microsoft and were given a "Yes"
http://gamrfeed.vgchartz.com/story/6756/iwata-refused-natal-technology-in-the-past/
I really doubt Nintendo would want to pull of a camera knowing they refused Kinect before Microsoft.
Maybe next gen, they may do something that can track your entire body flawlessly with 1:1 accuracy on every movement at any part of the body. Kinect is an impressive piece of technology but it isn't on par with what was promised on those fake promotional videos, and I think Nintendo would be interested on such a tech if it was actually capable of that.
Not to troll Kinect. Wiimote without the wm isn't capable of doing of what they supposed it would at the first presentation of the thing.
