I think they can hit at least 16 million by the end of the year but thinking something like 17 million is also on the realistic side. There's a lot of big games coming out and a second wave of sports gamers upgrading to the new gen. Between now and the end of October they should easily have 11.5 million worldwide, and after that comes the juggernaut that is the holiday season.
I'm thinking 12 million at the end of September - Its Destiny!!!
We shall see...