The next generations of DEX platforms need to develop solutions to the problems that have constrained their predecessors. First, the main problem is liquidity. Users should know that if they want to buy or sell some currency, then at the other end there will always be someone who is willing to trade with them.
Finally, it is very important that decentralized cryptocurrency exchanges offer a simple and convenient user interface. Earlier DEX was a platform developed by experienced users for other experienced users. If decentralized exchanges want to develop, then they should make a user-friendly interface even for beginners that will be no worse than Binance or Bittrex.
The Blocknet has already solved both these issues. First by making its decentralized orderbook available over API, so that exchanges can share liquidity. Second by putting development into an application that looks/feels enough like a traditional CEX with an automated installation/setup process.
Also the fees are currently really low. I think takers are paying a set 0.015 Block for a trade right now.
Come try BlockDX on Blocknet. Links are in my sig