No cryptocurrency cannot make real money disappear, the whole world still uses fiats it coult take hundreds of years before humans adopt cryptocurrencies as money .
As bitcoin is going performance and it keep its value high with respect in market so there is no doubt that bitcoin can do it because a place where I live bitcoin is now very strong and powerful and day by day its users are going to increased and our neighbor countries have also accepted bitcoin so bitcoin know how to make itself on the top there is a very big hop that in future bitcoin can replace or disappear real money from world.
Bitcoin can not do that, all things depend on the community of Bitcoin in your country and other countries are accepting Bitcoin. By the people, the government decided to accept Bitcoin or use it as an asset instead of a currency or payment method. Just only Japan is country accepted Bitcoin as a payment method.