Upvote, but the fork of Android that would have to be done to make it work as well as Winphone on the backend would be hard slogging.
I quite liked the 3 winphone based handsets I had/have (I know I am in a very small subset of mobile phone users!) and they did everything I needed in a mobile and did it better than the competition. Good battery life, good camera, good call quality.
Of all the things that MS do to piss me off, wrecking their phone division ranks right up there with everything Windows except 98, XP, and 7.