Sure it is.
And for argument's sake let's say you're right that it isn't a 10 foot UX; MS should treat metro like Media Center -- as an app that can be loaded at startup or optionally be the shell for those use cases where it makes sense (i.e. a tablet).
And that's why the orb and start menu have been replaced by a metro UI... Sorry but I don't need a Bob front-end to my desktop. And what about desktop development? WPF or Silverlight going anywhere other than being mothballed? Actions speak louder than words in my book.