If all countries converted to cryptocurrencies, all translation would be easy and fast. But I think all this will be very unlikely in the future. Because every country has its own currency, the value of each currency is different. If everyone uses cryptocurrencies, there will be no carrying cash, no fear of loss or theft. But it is inconvenient in small daily expenses.
translation?
well, fiat is also always on the verge of inflation, the use of cryptocurrency is not impossible, but it takes time. the generation process will touch the transfer of the algorithm to crypto and will still adapt the same fiat value based on official reserves.
your last few sentences may seem complicated, but the government can erase the cash payment mode starting from the area of their strategic economic zone which is expanded every year, all will still hold on to the process.