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 don't think that Bitcoin will destroy the fiat system. There are a lot of things to do if they will push this system. Not all people are computer literate and some don't have the money to have an internet connections to do transactions. It will be very hard to make all the people to joined bitcoin because not all of us understand the benefits of it.