Obivously, the PS3 would have to sell worst in 2009 then it did in 2008 (which it shouldn't) it should sell more in 2009.
I'll copy and paste what I wrote in a different thread.
The PS3 sold 11 million in 08 and is obviously going to sell better in 2009, but even if it sold the exact same and sold another 11 million durring 2009 then the total would be 30 million, it shouldn't sell less then that, what with the price cut and huge exclusives for 2009.







