Granted, Kinect was a huge seller; but this was a 'reasonably priced' extension on a proprietary and market saturated product. To compare that against a new product, with a price tag of $5-800 that had nothing to leverage off from, is a tad unfair.
If you had an X-Box 360 (as many households have) - buying the Kinect was a "Mid-life Kicker" that added a couple more years of playability to your dull console. Not saying the Kinect wasn't revolutionary - it was. But, it is an unfair comparision. Kinect (~$150) with tie in to established console and new games vs iPad (~$500-800).
Huh? 360 is at market saturation? You need to put the crack pipe down.
That has long since been eclipsed:
In the 2010 Christmas quarter in which the Kinect was released, it was the "fastest" selling for a short period... then it petered out. It sold according to Microsoft just just 8 million Kinect units during the Christmas season while they sold 6.3 million Xbox units.
Since its November 2010 release MS Kinect has shipped only 19 million units.
On the other hand, in Apple's 2011 Christmas quarter, Apple sold over 15.4 million iPads almost DOUBLE the number of Kinects sold in that Christmas quarter, and 2.44 times the number of Xboxes. In fact, both the iPad 2 and the New iPad exceeded the 60 day record of the Kinect on initial release. The New iPad sold over 4 million in the first FOUR DAYS...