MFC? Visual Basic? Bastardized Java?
By killing everything that works, Microsoft is making competitors lives easy as they can make users comfortable by just keeping things the same. Objective C is still well-supported on MacOSX and iOS. Oracle is sticking with Java as server software development language. First users and developers of Android and Chromebooks will still find a familiar environment.
I hope they actually tough it out and NOT kill Metro and its charms bar. While they are highly irritating to me personally, there are still millions of users for whom this was first experience with Windows and they would rebel at yet another breaking change. Keep them as an option and well supported until and unless users truly lose interest.