Games like God of War and Uncharted do not sell hardware. Only Gran Turismo and maybe Killzone 2 have any chance of impacting the sales of the PS3 in any significant fashion. With that being said, the most important factor for the PS3 right now is its price. A drop of $100 would likely revitalize PS3 sales unless Microsoft counters with another price-cut of their own. The idea of a price-cut is growing increasingly unlikely though due to the strength of the Yen and the economic crisis.