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.
That will be the biggest conflict if ever that happened. Most users will likely complain but I doubt government will do this, as some of them are actually into crypto as well. Its gonna be a long fight whether crypto become illegal, a lot of personalities and even big names are trading it. They could arrange some regulations and rules for it. But totally removing it? Its so impossible to happen.