I am pretty sure in the end accessibility will more likely be solved by some smart LLMs (with vision) interpreting arbitrary web pages on the user side, rather than by web developers coding it by hand. Because the latter obviously doesn't universally work.

I would pay money for a browser plugin that restyles every web page to a single readable/accessible design that I like. Think "Reader Mode" on steroids (that could transform arbitrary GUIs, not just blog posts).