For backend developers, this is super smart. When I'm running an app on my phone or in my browser, I don't care if the brains reside on AWS, Google, Azure, Rackspace, etc...

For the front end, this probably won't have much effect. Developers go where the users are and there's very little excitement around Windows applications (win32 or universal). If keeping developers happy was all that important, then Linux would be the dominant desktop OS.