From time immemorial, money has undergone various metamorphosis. So whether you like it or not, time will one day be up for the fiat currencies you are so much used to. Nothing lasts forever, and the fact that virtual currency can do better than fiat means we will say goodbye to fiat one day.
Fiat money cannot be eliminated and replaced by digital currencies, because the use of fiat money is easier and simpler where uneducated people can also use it. Unlike the use of digital money, besides requiring the internet, users also have to use smartphones or computers, which are more complicated. Most reasonable is digital money as a companion or alternative to fiat money.