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.
In my own opinion, there's a small probability that BTC will replace the fiat system as BTC is still under development until now. It's not yet perfect and the development will continue and we cannot tell when it will become perfect.
For the question, "WILL BITCOIN BE USED BY ALMOST EVERYONE IN 2022?", my answer will be yes but let me say not only BTC but the blockchain system or cyptocurrency.