They're trying a bunch of things, I'm sure some of them are working. I went to a JS conference recently and one of their dev evangelists was talking about using JS to control Arduinos or whatever. No proprietary-stack stuff in sight.

I don't have numbers to say "a majority", but a whole lot of developers don't use Windows. They really need to give up on the Windows-everywhere stuff, but as I understand it that was a Ballmer thing. Anyway, I mean, they're Microsoft. I'm sure they'll land on their feet.