In terms of application, Bitcoin will find it difficult to replace all fiat currencies. Bitcoin is a financial innovation that has several advantages over the existing financial system. It was not intended to completely replace fiat currency, but rather to give an alternative.
Bitcoin, like the Internet, is a revolutionary innovation that offers new ways of existence... however, while the Internet is widely recognized, not everyone in the world has access to it and is surviving.
So, don't let your fear of change lead you to assume that Bitcoin will reduce employment opportunities, because Bitcoin has generated and will continue to create many jobs.
yeah fiat wont be completely ruled out but people will end up given more value to bitcoin than to fiat and that is what is about to happen ans have even started in other places, like El Salvador that have allowed and accepted bitcoin has a ledger tender that is to show how that between will go and the government is putting in all effort to make it centralized, and i don't know why the government don't want to leave the system alone, and because of the financial advantage that bitcoin has that is why a lot of people are preferring investing in bitcoin than any other thing. and even before fiat gold was their and when the initiative of fiat came gold is still their so bitcoin is also consider an alternative with good benefits. and the change of bitcoin is getting better and the people are getting more interesting, if you have not buy your bitcoin now is the best opportunity.