Is there any hope for accessibility on Linux?
My guess is about the same hope as for the world at large. [/Cynicism after some ongoing issues with the bank.]
Potentially even better hope, given it's Free Software, where everybody's free to mend it, using the 4 freedoms assuring we can use, study, share, change the software as we wish. ... Albeit with some non-triviality involved.
A lot of itches being scratched... but do these successful efforts get shared and integrated upstream, and consistently re-availed? Keep raising awareness. Accessibility features are good even for those who do not have to rely upon them. The more this awareness gets around, the more reliably these features will be present more ubiquitously, and not just a niche implementation or after-thought.