Cryptocurrency is the future of all payment method due to the decentralized nature which grants financial freedom and power to the people. However, for it to replace cash or the Fiat, it will take years of awareness creation. Up to date, some people do not have access to internet whereas others do not know how to access it.
It's possible to be honest. But I think fiat money and cryptocurrency should still cooperate and operate. We can't live the other one while making great things with the other one. Since there are a lot of companies that accept bitcoin as a payment which is a great step for all of us and the companies.