Who's to say it has to keep moving forward? The companies are buying up massive amounts of GPUs in this AI race, a move that's widely questioned because next year's GPUs might render the current ones outdated[0], so there will probably be plenty of GPUs to go around if the CEO demands it (prior to collapse). Operating datacenters would probably be out of the question with a collapsed society as the power grid might be unreliable, global networks might be down and securing many datacenters would probably be difficult, but there's at least one public record of a billionaire building his own underground bunker with off-grid power generation and enough room to have his own little datacenter inside[1]. "Ordinary" people will acquire 32GB GPUs or Mac Studios for local open-source LLM inference, so it seems likely billionaires would just do the next step up for their bunker and use their company's proprietary weights on decommissioned compute clusters.

[0] https://www.cnbc.com/2025/11/14/ai-gpu-depreciation-coreweav... [1] https://www.businessinsider.com/mark-zuckerberg-hawaii-under...