I think crypto will boom again and again, of course not all the altcoins, but BTC and many others for sure.
I'm also expecting the centralised coins to go down and to see completely new guys on the top of coinmarketcap at some point.
Centralized coins definitely contradict with the basic or central idea of crypto currencies. Only those people who want little profit and do not long for financial freedom are the ones who would go for centralized coins. Majority is in the favor of decentralized and this is why bitcoin is on the top of list. I dont find any reason right now for doubting boom in crypto market in 2020 as the market is surging even at the moment.