Because X sucked. I hated X Windows, nothing worked right at all back then. Actually, the last time I used it, it still sucked. And how has X caught on?
I am on a dual screen X terminal, logged on a remote linux server (virtual quad core) and using rdesktop to access my desktop PC because I am not in my office.
In front of me, all the worktations (38) are running linux.
X windows is definitely the tool I use the most.
Very popular, to whom? Linux has what, 1% of the desktop market share. Linux is very popular on android, but I was pretty sure that Android didn't use X. That's like saying you were popular in High School because you had two friends. And apparently, from an article on HN, Ubuntu isn't going to be using it any further.