Looking closer at these numbers, I would actually say that they are not very favourable for Kinect.
If you look at the full Kinect games list, you will realize that there are only two games that sold >=100k and were not released within two weeks after Kinect's launch date :
Carnival games and Michael Jackson.
Personally, I suppose that means that after just a few weeks of hype and incredible sales, people very soon simply lost interest in Kinect, both in hardware and software.