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 think bitcoin will not destroy or displace fiat system because fiat is the money that we use many many years and there is some people will not agree for that, because there many people who don't really know bitcoin. But in the year 2022, I am sure that the number of people who using bitcoin will become bigger, because maybe in that year bitcoin will become so famous in all over the world.