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.

The Linux Desktop has been improving by leaps and bounds over the last few years.

More popular than the OS with majority market share is an unrealistically high bar for success. I could totally see linux become a mainstream desktop OS at some point.

It's definitely growing, but is still mainly used by techie people. Lots of people are still afraid of the command line or remember how was Linux +10 years ago. We'll have to do our part!