It just dawned on me that the purpose of Kinect is to enforce the new anti-secondhand game policy.
Using Kinect's facial recognition tech Kinect will determine if the person in front of the camera is the original owner of the game. If not then Kinect tells the Xbox not to run the game and alerts Microsoft.
How is that a solid security measure? It's easier for Microsoft to use their protocols already in place to ensure the content is tied to the system rather than using shoddy facial recognition.