kinect vs. sony's exclusives 2011

[landguy1]

Jay520 said:

There will be 5 million gamers who will buy a PS3 for Killzone 3. 

So, a sequel to a game that sold less than 3 million originally is going to not only sell more than 5 million(which i think 
will happen for KZ3), but it will cause 5 million people to go out and buy a PS3?  Really?