The problem of DEX is only one, there is little interest among traders, but if you look at what is happening on centralized exchanges. The future for DEX is already certain.
In the future, decentralized exchanges will become very popular. Moreover, the waves will make atomic swaps. The wave exchange from this will become even more popular. We are waiting for large volumes.
It's not that popular right now because we use it to exchange waves, or waves' tokens, when popular projects will use waves to deploy their tokens we'll see an increase, then people will look at dex's potential and they will start trading other crypto as well (right now dash, eth, btc, bch, maybe they will add more crypto in the future)