The Kinect has done wonders for amusement park and museum efforts. At this point I'm more surprised when those sorts of museum and amusement projects aren't using a Kinect. (...and more often than that it's simply because an old expensive system hasn't broken yet, but soon as it breaks you expect it to be replaced with a Kinect.)

For that reason, the commodification of the Kinect really has been a boon for science and entertainment. There are some commodity Kinect knock-offs out there (Intel's cameras and sensors come to mind), but selling millions of Kinects means that they will probably stay important to museum projects.

The secondary market will probably remain flooded with Kinects for a while, but maybe (hopefully) by the time it becomes hard to get a decent priced Kinect for such cool little projects there will be a Kinect 3 or similar ready. (Or Microsoft will sell the Kinect brand to a hardware manufacturer.)