I think that decentralized exchanges will lead in the future but it's too early to say that 2020 belongs to them.
Certainly not for 2021 as well. But time will come when we all need the privacy to escape the IRS because the centralize exchanges had hand out our data to them. I'm still one of the people who kept my anonymity from the exchanges though I have submitted to a number of them. I only use them when there is really the need to, I still trading on dex since bitshares had started.
Right now there are dex that has a ton of volume already particularly the
https://newdex.io/ I'm more concerned with exchanges that are capable of freezing wallets and withdrawals.