We are forgetting that China has a whole hardware ecosystem. Now we learn that building SOTA models does not need SOTA hardware in massive quanties from nvidia. So the crash in the market implicitly could mean that the (hardware) monopoly of American companies is not going to be more than a few years. The hardware moat is not as deep as the West thought.
Once China brings scale like it did to batteries, EVs, solar, infrastructure, drones (etc) they will be able to run and train their models on their own hardware. Probably some time away but less time than what Wall Street thought.
This is actually more about nvidia than about OpenAI. OpenAI owns the end interface and it will be generally safe (maybe at a smaller valuation). In the long term nvidia is more replaceable than you think it is. Inference is going to dominate the market -- its going to be cerebras, groq, amd, intel, nvidia, google TPUs, chinese TPUs etc.
On the training side, there will be less demand for nvidia GPUs as meta, google, microsoft etc. extract efficiencies with the GPUs they already have given the embarrasing success of DeepSeek. Now, China might have been another insatiable market for nvidia but the export controls have ensured that it wont be.