Lately everyone seems to be convinced that we're witnessing the death of the desktop computer, but I wonder if this could be partly due to the lack of options in this market. Apple and Microsoft have both dropped the ball here. Apple has eliminated hardware options that power users are looking for, while Microsoft still doesn't provide a decent POSIX environment or even a passable terminal.
I honestly wonder what the world would look like if Microsoft were to suddenly switch focus and deploy a version of windows with full POSIX support built in, a decent terminal, a first class package manager, and a decent app store. Instead they are removing features like the start button that confuse existing users, and adding a Metro UI that power users don't want.
Maybe I'm just getting old and cynical, but I think we would be witnessing stronger desktop sales if Apple and Microsoft were providing options that users actually wanted.