It's an interesting topic, and with the stlong game sales on consoles it worries me. Some games I simply want on the PC and with best graphics possible.
It worries me when I think of The Elder Scrolls 5. Oblivion's development had perfect timing with the first HD consoles, and looked fantastic on all platforms since the engine could run well on the PS360. But will they have to put restrictions on using the latest graphics options, AI-routines, physics etc that will be used in PCs 2010/11 when TESV is likely to be released, just because the consoles can't handle that?
I'm afraid that many game devs, including Bethesda, are developing their games on engines that run on the PS360 and the PC versions will suffer from that. But there are always going to be passionate game devs that will "go Crysis", and create/use leading edge advanced game engines no matter if it can run on the consoles. Then use a simpler engine and even use an outside dev teamfor the console versions.
The 3d party support for the PS360 will be very good no matter what. The cash is just too good on consoles, so some version of most PC games will be released on the PS360 too. Crytek with Crysis is the horror example that many devs/publishers will look at and try to avoid.
Crysis (the big blockbuster AAA PC exclusive) - estimated 1.5 million lifetimes sales
Far Cry 2 (=Crysis for PC and PS360) - probably 4-5 million.
