My answer is no bitcoin cannot replace any other physical currency because some other government instution banned bitcoin in their country and really for the fact that bitcoin anonymous well i can say theirs no way it can replace dollars because first dollar is the biggest contributor in economic trades as we can see what we see symbol for currency we trade online its always dollars, and that stated how power is the dollars thay influence global market thats why bitcoin is nobody for dollars.
Indeed bitcoins are unable to replace fiat because fiat has very deep roots in the world economy. Dollar is paper money and people will not stop using it because they feel comfortable dealing with paper money. Otherwise nothing could have stopped bitcoins from knocking out from the economical system.