The Kinect is an accessory, not a console, so already, before the thing even comes out, this claim is a load of shit.
Also: Hardcore gamers bought the 360, and want nothing to do with Kinect. Casual gamers won't have a 360 to get Kinect, and would most likely get a Wii for a cheaper price. If Kinect WAS a platform, not requiring the 360 to even FUNCTION, this might have been at least a tiny bit profitable. But the math on this is all wrong.
Also: Hardcore gamers bought the 360, and want nothing to do with Kinect. Casual gamers won't have a 360 to get Kinect, and would most likely get a Wii for a cheaper price. If Kinect WAS a platform, not requiring the 360 to even FUNCTION, this might have been at least a tiny bit profitable. But the math on this is all wrong.