As long as coin holders share custody with Centralised exchanges, the exchange's carelessness and insecurity will be everyone's problem, especially when the team behind the exchange is fraudulent as well. The ability to set up trade orders and P2P trade on decentralized exchanges could reduce the use of CEX, as there are currently no decentralized exchanges that offer such services. DEX needs to keep improving its use and trading since they seem more secure
DEX does need to keep on improving, but that doesn't mean that CEX will stop, the more DEX world improves, the more CEX world will have something that DEX doesn't have. Which is why it's very important that they fight on the ideology part and not just the tech part.
If they keep fighting at the innovation and tech part of the situation, they are going to stay behind and not make any money at all and it will be something sad to watch, but if they go out and talk about how they are decentralized and they can't be hacked into because they are not keeping anyone's money in a centralization location, that alone would get enough people to make it very good to use.