MS is seriously burning through their marketshare capital. They think they are untouchable and can pull this crap. They were able to recover from Vista with an excellent Windows 7 release but Windows 8 is an order of magnitude more off-putting that UAC in Vista ever was.
Many companies reversed bad decisions by starting with "Due to popular demand, we decided to bring back...", and then MS should release a patch that reverses the castration they did to the desktop. They will have some egg on their face for being "wrong" for a short while until people forget about it, and we will all go back to being happy again. Failure to do so will just result in more and more people looking for alternatives. As far as I can tell, there is absolutely zero advantage whatsoever in destroying 20+ years of desktop evolution for the sake of forcing Metro down our throats. None.
Metro on tablets is another thing, but we are not talking about tablets here.