I'd say there's always room for a product that works well. Textmate, back in the day, had to come in and compete with well-regarded software after all -- even if we ignore vim/emacs as being insufficiently-Mac, there was BBEdit.
I don't know that I'd say Sublime users are "stuck". The long beta on v3 seems to be splitting the community, somewhat, but it wouldn't be surprising if the final release resulted in it consolidating again.
Perhaps, but either way as a ST2 user I'm looking for a replacement and once ST2 does not meet my needs I'll either go back to emacs full time or look towards something else for light weight stuff.
I've already movers most of my we stuff to IntelliJ/WebStorm. I really liked ST2 but was a little miffed that right after I bought my licence ST3 was pushed to the forefront of the site without a reasonable upgrade plan.
I do certainly agree that the new-version / upgrade thing has been poorly handled. If nothing else, announcing it and causing the split should have been followed by rapid development instead of over a year of slow beta releases.
I don't know that I'd say Sublime users are "stuck". The long beta on v3 seems to be splitting the community, somewhat, but it wouldn't be surprising if the final release resulted in it consolidating again.