One of the big questions with the launch of Move then more recently Kinect was how would this affect demand betweem consoles. At least in the UK, according to Eurogamer, the result is essentially zero, with Kinect boosting 360 sales but not seeming to harm PS3/Wii demand and of course by extension we can see that despite the nice launch of Move it hasn't stopped 360/Kinect surging ahead.
http://www.eurogamer.net/articles/2010-11-17-uk-ps3-sales-unaffected-by-xbox-surge
My feeling comming up to the launches was that this might well be the case - that each console would see a boost, particularly in territories that they were strong in, but that overall neither new device would turn out to be a killer blow in terms of harming the others sales.
If this holds true more globally, then Kinect/Move will likely be more about how much additional sales/demographic install base they can help secure for PS3/360 vs actually hurting sales of the other. Perhaps more interestingly, with minimal impact on the Wii's sales/trends they may not slow the Wii's natural sales curve from progressing either.
Of course, the month or so might show some changes, but for now I think Kinect/Move are more about what they can do for their console vs actually slowing the competition down.
In short, it's still a three horse race with one a fair bit in front and two neck and neck and that's probably not going to change anytime soon from a worldwide perspective, although certain territories are probably now cemented in stone.
Thoughts?
Try to be reasonable... its easier than you think...