I think MS got blindsided by iOS and Android, just as RIM and Nokia did.
RIM tried to evolve, but never quite got it.
Nokia gave up and left themselves in MS hands.
MS quickly made a new mobile OS that can compete with the big boys and is about to launch that product in some flavor to mobile and desktop. However, it may not go well and it is very late to the party.
I think MS should continue with integration and what is has with WP, but it should do so not at the expense of the very popular desktop OS basic setup. Instead it should take a look at Android and see how its latest versions simply provide uniquely different and specific views of Android ICS in phone and tablet form. Extend on that to have three basic UIs with desktop being the third. It can be done while also incorporating fully application support very easily.
With MS base in desktops, they'd quickly close the gap on mobile apps as Win8 should be very good and downsizing a desktop application for tablets (pretty much identical) and phones (def downsized). Once you have that integration, Win8 would definitely take off on all platforms.
However, I think MS is going to force the same Metro UI on desktops which probably isn't a good idea and might create another WinME/Vista type of backlash.... at least until Win9 comes out with forced Metro removed.
2013 will be an interesting year for mobile and desktop OS.







