Fiat currency is what we need to maintain the global economic system. From my point of view, even cryptocurrency has a lot of advantages, it still can not become an official currency and we also can not eliminate fiat currency.
We can do this because it is a currency only but crypto currency is an investment as use to invest it for our better financial crises. We can reduce the number of crises and we can get better earning resources we should try to use crypto currency the most as it gives us profit as well saves our future we can do anything with crypto what we can do fiat, so the future of fiat is not so good according to me.
but if in my opinion the fiat currency will not be eliminated and replaced with a digital currency, because the fiat currency has become a symbol of various countries, if it is removed, the government certainly will never remain silent and it could also be banned by the state country in this world