I'd like to know this too. Its concievable that most new web content would be output from an LLM so it would just be feeding on itself. That precise outcome will never quite happen as people will transform and validate this output. However, I see sense in a general worry that people "won't bother" if LLMs can do it all easier than a person. Conversely I also see the potential for it to bootstrap for even greater potential human expression, learning and applied thought.