This will be controversial but I believe Linux will become the desktop of choice in the long run. Here's why. Tech like Docker is making it easier to deploy whole systems of software, not just in the cloud. Google has put most of the apps 99% of users use 99% of the time on the Web. Everyday users are moving away from the desktop anyway. And the whole litany of other typically quoted reasons to use Linux like security, package management, lack of viruses, performance, ect. Finally companies like Microsoft and Apple will find it too expensive to maintain their subpar OSes when they make all their money elsewhere anyway. E.g. iTunes, iPhone, enterprise software[1]. It probably still a long ways off though.

[1] http://www.zdnet.com/article/apple-google-microsoft-where-do...