I do think the release of Windows 8 ARM will be one of the turning points that might lead to us seeing some exciting developments in the desktop market. Frankly, x86 development has been pretty boring ever since Bloomfield’s release.
To clarify, this does not mean I think Windows 8 ARM will be wildly successful, neither does it mean I think x86 is going to topple (one would have to be wildly delirious at this point to think that). But I do think a change in the perception that consumer software has to be x86-compiled to sell successfully will lead to interesting developments in the direction of consumer hardware. We have seen iPhone app development grow into a lucrative business for some companies/devs; now we just need to see the usual apps we use on desktops/laptops compiled for ARM (eventually).
I, for one, can’t wait to see an RISC desktop processor.