Immortal on 15 December 2010
Kinect's doing ridiculously well and is crushing expectations upon expectations, but I still doubt it'll top 20m. Wii Fit did marginally less in the same period and it was released in March. Even after that it only sold a little over 20m. Admittedly WFP cut into its legs, but Wii Fit was on a much bigger and healthier base anyway. Besides, it did all that on less than $500m for advertising.
Not to say that it won't do well, though. It'll do phenomenonally!
“These are my principles; if you don’t like them, I have others.” – Groucho Marx
