I think yours is a very pessimistic take.
Why are you bothering with Discourse then?
I get that fewer people will bother with Reddit, because the interface is atrocious and the user experience is awful. Chatbot interfaces are way better than Reddit!
But AI cannot survive without novel content.
Many content providers including independent forums and news sites will be hiding more content behind paywalls and trust screens, forcing visits outside of chatbots.
AI will not have all the answers or the newest information.
It will be increasingly expensive to train new models as they get bigger and bigger and so web search tools will be the order of the day as they will always lag 6 months behind in information novelty. And where there is web search, there is SEO …
In any case people want to talk to people not bots all the time so they will still seek out the town squares.
Why are you talking to me if your ChatGPT account suffices?