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 do not think that Bitcoin is going to be used by every one in the future because many people are going to think I have no reason to make use of Bitcoin.
Most people just think that it is waist of time and that they can do better things with that time. I know this because I have talked to people who sad this.