It's not all-or-nothing. Banning Chinese models in the public sector and strong-arming the private sector against using them would already do great damage. Similarly, open-source training could be stymied by any of hardware embargoes, taxation, or regulation of larger players.

Sure, it's possible for regulations to make things worse, i will agree. But without regulations it's pretty clear things are going to end up VERY bad, and the only knob we have to make it not bad is regulations. So it's important we try something, and work towards doing a good kind of regulation, or any one of the bad futures you imagine is pretty likely to come to pass.