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 there is a possibility for this to happen since the price of bitcoins will increase even more in the future due to further demand and if the price of bitcoins will still growth then there is a huge chance for banks to demand on banning bitcoins because people will prefer on investing in cryptocurrency more than fiat due to its growth.