So at the end of the year the numbers will be more like the following:
360 3.7 million away from 20 million
PS3 2.31 million away from 10 million
Think with a PS3 price drop in March and 360 price drop in September it will be close, but think PS3 will get to 10 million before 360 gets to 20 million.
Its libraries that sell systems not a single game.