Thats''s one very angry take on things. As a blind person myself, AI is a net benefit, it has potential, but I also agree that there are lots of people who think that if AI solutions are good enough, there is no need to invest in actually accessible gui-s. The last one is an extremely wrong take, because ai-s always will be the slowest solution which might be badly prompted or just hallucinate. Just today someone was complaining that Gemini's code editor is not fully accessible and was looking for advice there, so I'd give the author points for mentioning that the very ai interface might be unaccessible. Not to mention that often chat web interfaces lack proper aria descriptions for some basic operations.

Could you approximate number of blind persons using AI?

If their number is significant, they could themselves be foundation for some AI business, even if all other consumers will turn away from AI.

For about accessibility of web, must say it is terrible even for non-blind person, but AI could also change this to better.

What I mean, you may hear about PalmPilot organizers, they was very limited in hardware, but existed private company, which provided proxy-browser, which input ordinary web sites and shown on PalmPilot small display optimized version, plus have mode for offline reading. With existing AI now could do much better.