I don't think Win8 on ARM will be a huge success. Not even a moderate one. What I think, and Microsoft seems to agree, is that ARM based devices will dwarf the x86 PC market, driving it to irrelevance. The x86 PC is Microsoft's cash-cow and they have nothing to replace it.

So, again, Windows on ARM is where Microsoft is going and whatever action MS gets, will be from it.

Won't be much, but if they manage not to screw it up, it may grant Microsoft a few more years.

And yes, they are doomed. Good riddance.