Crypto adoption is happening rapidly and I think there is a very little chance to be restricted crypto worldwide. Either Crypto will be more popular and Cex exchanges will be more trusted in future. If accidentally Cex exchanges exits then Dex exchanges should develop more by adding good features otherwise it will be a very backdated experience to continue with only dex exchanges.
the development of the DEX exchange has also been quite rapid and more and more features are being provided. In fact, many new blockchains are emerging with various DEXs supporting them. CEX may still be needed to bridge the gap between crypto and fiat money, because everyone still needs fiat. The crypto world without CEX still doesn't seem like it will happen, CEX are getting serious attention from the government and will be supported if they continue to pay taxes regularly. Like it or not CEX is still needed.