I personally don't believe that DEXs are going to necessarily bloom into widespread adoption all of a sudden.

The fact is that cross platform and fiat integration is still lacking despite the best attempts of DEX providers to create their own stablecoins or token representations of altcoins that are not on their platform. Thus, it's difficult for people to turn down very mature centralised technology and move to complete decentralisation in this field within just a year.

However, I do think that in the short run, they can generate some hype. Especially in the case of a potential broad based bull market in 2020.