Man. LLMs are basically auto-complete systems. This scenario you're painting seems too far-fetched for this technology at any timeline you could propose.
just five years ago it would be far fetched to suggest that we would have what we have now. its clear that peoples intuition about what is likely and what is not is not accurate right now. and this scenario is actually the opposite of unlikely, its inevitable. the economic forces will not allow any other outcome. its not really surprising when you consider how inefficient market based economies are, how inefficient and fragile humans are, and the fact that communism has already come close to working in the past. even without AI, centralized economies rival decentralized ones. and the loss of human agency that comes with centralized economies cant be dismissed.