Definelty a yes. We've already seen a picture of the wave of DEX's that are going to be coming in this year, with the new McAfee DEX, even though he has had questionable involvments with projects (mostly ICO's), he always is quick to get on the next big thing and it's a good sign.

It all depends on how they are structured, some exchanges like IDEX are only known as "hybrid exchanges" because they aren't fully decentralized and do have access to some parts of your information.

2018 was ICO's, 2019 was IEO's, and 2020 will be DEX's!