I think it will happen someday, if the cryptocurrency hype is crowded like in 2017. In that year all coin prices rose very dramatically like ethereum and bch, I think in 2021 it will happen like 2017 because I am sure the hype will be big considering halving bitcoin happened in that year, we'll just wait where the market will go.
Market condition change everyday. If there is a circle and if we see 2017 alt season at 2021 it will be great for traders and investors. But also must be careful as 2017-2019 bear market than can be seen during 2022-2024?
I am not sure crypto will see a bull market which seen at 2017. At 2017 market conditions were different completely. Most of the people invested on the system which they have no idea. Many people put money with closed eyes for becoming rich in a short way.
Today, it is very easy to reach information about crypto. People can reach knowledge easy with little research. And people are more and more careful about crypto world.
Soon or Later bull market will come again. Maybe we will not see 100X as 2017 but my expectation is at least 10X at new bull market with changed conditions.