For better and worse everything productive is becoming OS agnostic. In 15 years I don't think many first-class applications will be truly native. They will be UI via HTML (webapps, electron, etc), CLIs based on POSIX, or company maintained UI frameworks which break OS styling conventions (JetBrains, etc).

OS agnosticism isn't just webapps taking over. Docker is making development from the ground up be OS agnostic.

I see this in my personal life as well. Every day I use MacOS, Linux, and Windows -- OS doesn't really matter much anymore to me.