The paranoia is thick in this thread :/
The NSA is not live-streaming millions of Kinect streams simultaneously 24/7. Just because they *CAN* tap your phone doesn't mean they *ARE* tapping your phone all day every day. From a technological perspective Kinect livestreams to some NSA database would rival Netflix traffic. Our infrastructure just can't handle that, sorry.
The NSA surely has systems in place which are "smart" and can flag and pull those data which it deems interesting, out of zillions of GB of "not so interesting" data. Do you doubt that the NSA has the $ or infrastructure to do exactly that?
It's not about a system which would monitor, in real time, millions of live-streams at the same time, all it needs is an intelligent system which triggers based on whatever criteria, say, at some point flags a certain IP or account.
And now tell me, let's assume an IP or account (email, social, gaming, fb, etc.) had been flagged for "targeting" at some point, that it would be "unlikely" that the NSA then would NOT use all means they have to gather intelligence. And you seriously think they would conveniently ignore or not take advantage of the fact that there is a camera and mic attached..which COULD be used...or do you believe it would be "technically too outlandish" that the NSA would use them?
All it takes would be an interjected program or backdoor remote access, and the NSA or whoever would know about your household, who and how many live in it etc. ---> that's what the NSA does and it would surely be one type of valuable intelligence which I cannot see the NSA would simply let go by. (Think of potential terrorists, bomb-builders etc. and the need for someone to know who actually lives in a home, their schedules etc).