Due to the lack of almost anything, centralized exchanges will just fail. For now, as soon as they are made user friendly and faster there is a little chance haha. We don't want to be controlled by banks, governments or institutions, that is what Bitcoin stands for. Thats why DEX is very solutive in that sense!
Dex's are extremely important because they lead to further decentralization of cryptocurrencies which is vital to their survival in a long run.