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.
I know electronic money is one of the new things and is being highly appreciated. But it can not replace fiat money. fiat money has a lot of different meanings. It is historical and you can not use technology to replace it. That is my own opinion.