I bet microsoft is really regretting Win RT and windows phone, if you could do it all over again I am sure MS would have just used x86 across all devices + win8. Nobody would have guessed that Intel would be able to pimp out a quad core atom that is competitive with ARM in terms of power consumption. Intel used to be butt buddies with MS, not sure why they did not clue MS in. Now you have full windows 8 tablets starting at $300 with a quad core Atom, where is there room for RT, in the near future once atoms go into phones where is there room for windows phone?
MS should just dump RT and windows phone now, they will eventually dump it in favor of win8. A single device that runs win8, stick it into a docking station and I get a laptop/desktop experience, on the go you get a phone/tablet experience, no bloody files to sync across devices, or sh*tty MS office alternatives, or sh*tty mobile games. Put thunderbolt it and 99% of people will be happy as pigs in sh*t.
Windows x86 has the largest market share of any OS (not counting linux on routers), it is huge advantage, Win RT and windows phone does not leverage that advantage. Why fight an uphill battle when you can charge downhill with the might of all the legacy windows x86 apps behind you.