OpenAI and Anthropic are already unable to make SOTA models generally available (and support this, oddly enough).
If huggingface or whatever is forced to take down open source licensed weights, there’s always bittorrent.
Export controls are one thing, but the US doesn’t really have import controls, and there’s no copyright issue, so DMCA, etc don’t come into play.
It’d take the courts years to decide how to contort the law to ban open weight models, and by then, it’ll be too late (and also pointless).