If crypto becomes extremely popular in the future (widely adopted by a vast majority of people worldwide), it's probable governments will turn against it. They can pressure centralized exchanges to close up shop or face serious consequences in the long run. After all, these exchanges are the on and off ramps from the crypto world to the Fiat world. While not every country is against crypto, they might change their stance once they see Russia using it as a means to avoid sanctions.
Imagine if most countries unilaterally agree on banning centralized exchanges for good. Will that mean the end of crypto for good (even though it would still be possible to get some crypto through decentralized exchanges)? After all, most people will be afraid of using crypto if it's declared "illegal". The ban of centralized exchanges will surely topple crypto prices, signaling fear among investors and traders alike.
What are your thoughts?

I don't know, if this happens then there could be a huge influx of CEX moving to a friendly crypto countries. I think this will be the only solution of countries started to banned them. I mean it's going to be very difficult to stop crypto, every one is trying to get on-board including countries. So I doubt that "unilaterally" there will be such a ban.
Besides, crypto is decentralized, the only way to stop it, is to cut the internet around the world, which is not going to happen unless we are in a world war or something really happen like huge earthquakes.