I want to see a real 100% decentralised exchanger but the transaction is fast just like binance and also the apps as ez as binance. It would be awesome exchanger and people will choose to trade there. Another one is bitcoin fee can get lower with fast confirmation.
It is possible in the future we do not even need decentralized exchanges, one thing that the lightning network will bring and that is not talked as much are atomic swaps, basically you will be able to exchange your coins from one blockchain to another, this will be amazing since we will able to conduct peer to peer trades safely so you could exchange your coins with ease from one blockchain to another.