Reading all your answers calmed me down a bit :) Thanks
I think our major disagreement here is the "look ahead".
I strongly believe that computers have reached the point where this relentless upgrade cycle should and has stopped. If you bought a P4 with HT and 1 GB in 2003 it is still perfectly capable of running the newest software 95% of desktop users need. Machines like that can turn 7 YEARS soon. People will look for computers that use less engery and don't have moving parts that just break after a few years.
PCs will be like old TV sets and work for many many years (10 to 15 years). The software has to adapt. That is the "look ahead" I see, but I can understand why Red Hat plans for something different.
I think faster ARM,Mips and Atom CPUs are the architecture most desktop Linux kernels will run on and the relative percentage of X-core X86 monsters will decline (maybe even rapidly).
And no I don't think Fedoras smolt data is any good here. Fedora users are technical people and are unlikely to run really old hardware like my sisters for example.
I also don't think Linux will ever get problems with the fastest computers, its dominance in the HPC area will make sure of that.