Such a situation could have happened to Bitcoin, if the state closes the exchange exchange, it is not a threat to Bitcoin, on the contrary the value of Bitcoin is even more valuable.
Can you explain why if all countries ban all centralized exchanges, bitcoin price will go higher? There is a huge difference between some countries banning and all countries together banning. I don't think gambling could survive if all countries got together and banned it at the same time. Likewise, bitcoin would drop significantly and lose most of its appeal if all governments banned all CEXs because as we all know, most of the market liquidity lies in CEXs.
Remember the mixer? They didn't disappear completely but since the US government cracked down on them. But very few people care about or use them anymore, and they also face many difficulties in surviving. What if the United States were more determined, working with the rest of the world to destroy the mixers once and for all? I don't think they can continue to exist.