I wouldnt be surprised...
if Windows didn't morph into a window manager, desktop apps and API running on Linux.
Microsoft has to decide where its future lies.
It's lost the home desktop to smart phones.
It's lost the smartphones to apple and android.
It's lost the servers to Linux.
What is left apart from legacy? The corporate workstation and its apps.
If those apps would run on a linux chassis, who cares about windows, per se?
I.e. a Microsoft supported version of WINE plus a Microsoft branded suite of desktop apps and window manager...