Why should nintendo do anything? Last time I checked they were happily crushing the competition regardless of Kinect.
i am pleased with Kinects sales but some of the you seem to think Kinect is some sort of new rocket science, time for a reality check. It's a moving camera(s) with software.
With all the Kinect clones coming out of Asia Nintendo should be able to pick up one for a fraction of the price should they so desire.