They've been 100% rejected. Linux conferences seem to only care about things like containers and automation these days.
X is like emacs. Doing it well is hard but there's a lot of power and flexibility under that hood if you spend the rather significant effort to discover it.
Its 40th birthday is coming up. Like JavaScript, CSS and PostScript, it's an imperfect system with compromises that gets the job done.
I'm probably just going to do the talk proposals as a write-up.