You know fiat and cryptocurrency is an asset they have both advantages and disadvantages so they should co-exist no one will replace another. Yes, cryptocurrency has more potential and better than fiat but I am seeing in the distant future fiat will still exist and it is pretty needed in our daily lives. If no fiat there will be no stablecoins that are backed with dollars.
they will not completely replace each other, but I think that in the future, cryptocurrency will be a more popular tool to use than fiat money. obviously it is more convenient
I believe that cryptocurrencies will not be more convenient for payment than national currencies. The thing is that the cryptocurrency rate is constantly changing.