It is not just a matter of software selling, its also the effect it has on hardware. PS3 has never had a real system selling game. MGS4 came close but that was hardly a bump, and its been declining ever since. I don't know where people are pulling 60 or 70 million from in terms of PS3's Lifetime estimates. If it passes N64 I would be surprised, as I doubt it will make it to 40. Graphics haven't mattered thus far, why would it suddenly matter all of a sudden?
After a certain point, pricecuts are seen by the public by something that was once desirable no longer holds as much value. The third party deffaction has been happening since 07 when MH3 was cancelled from the ps3 and moved to the Wii. DQX is another instance of this resource allocation. The only thing "stalling" this is the 360; Not that it isn't happening but now once exclusive Sony titles are now multiplatform. They wouldnt be if Sony had a more viable platform.
Marketleaders last the longest, it isn't technology that determines this. Look at the N64, the Xbox or Gamecube, guess what they have in common with the PS3? They are the most powerful consoles of the generation, but they were dropped before the PS2. It isn't rocket science here.
Bet between Slimbeast and Arius Dion about Wii sales 2009:
If the Wii sells less than 20 million in 2009 (as defined by VGC sales between week ending 3d Jan 2009 to week ending 4th Jan 2010) Slimebeast wins and get to control Arius Dion's sig for 1 month.
If the Wii sells more than 20 million in 2009 (as defined above) Arius Dion wins and gets to control Slimebeast's sig for 1 month.
