I'm hoping that this is a one time correction now that the PS4 supply has started to recover in the US, because if MS loses out in the US in March with TF coming out, they're in trouble. It does indeed appear that despite what I thought was an impressive forward-looking vision, the Kinect is just too much of a weight around the console's neck. It just doesn't work well enough. They really need to consider a SKU without it. By most measures the launch lineup is more compelling on the XB1, so I can't imagine that it would be anything other than the Kinect dragging it down.
Price is dragging it down yes, so let's just drop Kinect and everything is solved! ... well, no. We are at Month 3 for god's sake. Whatever devs are working with Kinect it hasn't even come out yet, so I wouldn't expect what you are talking about until around Year 2.