I think it was supply constrained.
Perhaps many 360s were needed to replace RROD.
I do believe that PS3 will continue to outsell 360. Who knows what will happen when the price drops.
Bring out the Ultimate now for $549
Drop the price of Elite to $399
Drop the price of Pro to $299
Drop the price of Arcade to $249 or drop it altogether.
If not, Ps3 sell more but not dominate over 360