AI is a tool to help humans learn. The sooner the majority realise this, the better.
AI is currently nowhere near good enough to produce reliable, quality content that would serve any useful purpose on forums, beyond very niche uses like previously mentioned perhaps on a support forum or such. I doubt if AI will be good enough in the next 5-10 years to be able to be used for active participation in forums, that being said I don't rule it out altogether, the advancements in technology even in just the last 20 years have been unbelievable imo.