Well, it seems that Binance DEX was a huge disappointment after all. Banning US customers as well as many other countries simply defeats the idea of a DEX.
It's just their site that banned certain countries. If you want to use that exchange you can still do so, but that doesn't change the fact that it's still a centralized platform completely in control of their main Binance platform.
Once DEX's get a bit more volume overall and a bit better technology, they will most likely surpass centralized exchanges.
For that to happen decentralized exchanges need to be as fast as centralized exchanges in every way. Traders and market markets bring in liquidity, and as long as they avoid decentralized exchanges, nothing will change.
That being said, for low value buy low sell high trades, decentralized exchanges are working well more often than not. People don't use it because of their volume bias, which is a shame.