It is said that bitcoin will destroy the fiat system but i believe that if this happens the world will change completly because banks and a lot of things will go out of market.
I believe that most people of the world will use it because of its better to transact than fiat. Like we can directly use worldwide trading. But I am not sure if what the market will be in the future.
We never know about that but i'm pretty sure more people will use bitcoin and bitcoin become more popular in 2022. If we talk about everyone use bitcoin in 2022, it's possible but i'm not sure about that. There are still many people in this world that don't know about bitcoins.
Just see the price of Bitcoin at now, you can know we have not much Bitcoin user. The world have 7 trillion population, but total supply coin of Bitcoin is just 21 million coins, but this is the max supply and we still need a long time to mining all that amount.