There should had been a clear distinction between the two environments. As it stands now, metro is billed as the only start menu on x86 devices, but the full os on RT devices. This is confusing and offers no compelling reason to buy the RT version.
I see Apple releasing OSX as an iOS app in the near (>=5 years) future. The reason that will work for them is because iOS is a standalone brand that people understand.
Just my 2¢, I'm not a windows user.