It should come right after year of the Linux.
Then we're doomed. I use linux (Fedora) as my daily drive, but I don't see it becoming more popular than Windows in the near future.
I think with handhelds becoming more and more viable, and thus hopefully more popular, steamOS and other distro's will be a must because of the god awfull windows handheld support. And with more people using them, they will also get better over time.