Consoles have a set standard of hardware specifications for their lifetime, and this was the first generation I really thought consoles attempted to up the ante in a serious way, because while I agree with you that a SLI GPU was more powerful, the PCs of the time didn`t have multicore CPUs running at 3.2 GHz and VMX units to help them, nor GDDR3 memory.
The most powerful CPU available at the time of the 360 launch was the AthlonX2 4800+. Thats 2 cores running at 2.4 GHz and given the massive differences between the architectures I expect thats more than enough to at least match Xenons performance as a gaming CPU.
And PC's were using GDDR3 at that time. What do you think was on the GTX512? A pair of GTX512's offecred a total of over 100GB/sec of graphics memory bandwidth through their GDDR3. The PC's system memory would have been standard DDR running at 400Mhz (6.5GB/sec).
I am merely saying that the "real" new console games won't even hit the shelves for a few years - due to the 5+ year dev cycle for them. Hard not to think that of the blockbuster games in the next years, how many will be PC only? I think the 85% industry-wide console profits will climb to 90% or more with the only real holdouts being Ensemble Studios, Valve, Blizzard....
Yeah and how many will be console only? Or specifically to the console that you own? Most games are going multiplatform these days due to increasing development costs. That trend will increase with time, not decrease.