If bitcoin replace dollar many early bitcoin adopters who have lots of bitcoin in store will dictate the world economy on their terms.Bitcoin supply is limited,those who have good amount of bitcoin in possession will manipulate the market and become a self proclaimed governments.I hope bitcoin never ever replace any fiat
You are not correct about Bitcoin. It has the potential to replace not only dollar but any currency as said by the CEO of Twitter and Square Jack Dorsey that Bitcoin is a future currency. Japan is also an example.
As dollar is the power hub of all the major economies of the world and most powerful currency in the world. The dollar is so popular in the most country so I don't think it will replace ever and a lot of people use dollars. They understand what dollar is a real money. For some people if they hear bitcoin they think is fake or they just don't know what it is. The most of them they don't know how to use so yeah.