Nobody involved in Gemini wants "widespread adoption", because that inevitably means big commercial organisations coming into the space where right now they're having a lovely time building a community.

Screen readers handle Gemini just fine - one of the clients I've tried outputs text and buttons in a GTK window, another literally just outputs text into a terminal and takes command line input, if a screenreader couldn't handle that I'd be horrified. The format is paragraph-based, there's very little styling, no guessing at what the main content on a page is.