There will be certain PC-centric developers like Valve that will probably start to do more 360-exclusive products (usually with a PC port as well) but it will never reach the scale of PS2 without MS giving out cash incentives, I just don't see 360 pulling that far ahead in the race.
I think sometimes hanging out on VGChartz causes us to miss the forest for the trees: earlier this year everyone was declaring Microsoft's doom, now everyone's declaring Sony's doom. In the big picture, 360 has built a measly 1-2 million extra lead over what it had two years ago. I think it needs something like a 15-20 million lead (or lets say 60% more units sold) before most publishers will stop doing ports.







