Provide us a DEX that is competitive and at par with the big private exchanges. It should be fast and has a good interface. And people may consider this. Until then, centralized exchanges will continue to enjoy the highest trading volumes.
Stakenet is by far one of the most promising ones I've seen.
Speed: It's based on Lightning, so you'll be able to trade instantly/just as fast as any CEX.
Liquidiity/Volume: Their DEX Aggregator will combine DEX orderbooks together, which will benefit all existent DEX's and add a TON of liquidity to the DEX.
At some point I'm sure we'll see a shift, where people move away from the centralized solutions, and only use them whenever they want to "Cash Out".