1 by 1 they will all go down till people open their eyes and start seeking for security. What do you think? And are DEXes going to be more usable exchanges instead of CEXes in the near future?
DEX is not a solution of that problem. While the exchange is decentralized, user and his funds are still centralized. So in that case hackers would attack users. Similar things happened with etherdelta that is now RIP.
Also, in case with DEX there is no chance for user to get a refund while centralized exchanges are responsible for other people's money and have to pay a refund. Probably this is what Binance gona do after their recent hack. We need stronger and more reputable exchanges.