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.
It all depends on the acceptance, regulations of each Central Bank of different Countries.
It may worth to note that the btc price already surpass the 10thousand U.S. Dollar tresshold,
given the issues on crackdown, banned and other related regulation info's by other countries.
I Am still Optimistic to see the btc usage on transaction, trading and any other related activities,
once this is globally accepted.