They will not actually shut it down. Rather, they will simply continually posture in that direction and release a statement that the wrong lawyer can interpret the wrong way. This will make it a soft no-no for anyone involved in government procurement which is most big companies thus ensuring american AI companies have the market, while also ensuring startups, etc still have access to the structurally lower-cost chinese models (otherwise, they will simply resort to the black market which is why they will never enforce a full ban). In most US-adjacent countries like India, anyone that sells to US companies I see avoiding chinese model providers for the same reason. The exception is fine tuning and running it on their own hardware, which naturally everyone is completely fine with since no money flows to the chinese model company.
Tl;dr, it's purely an economic argument. Every major argument in the world is about money and thus power, don't bother analysing it technically.
Tl;dr, it's purely an economic argument. Every major argument in the world is about money and thus power, don't bother analysing it technically.