Bitcoin does not need to be the only currency in the world. Bitcoin use is allowed only in countries. Already many payments can be made with bitcoin. In this case, why is bitcoin the only currency? Or why would world countries accept this? It does not have a fixed price. There must be a certain price for this to happen. If we think about this, the value of each country will be equal in monetary terms. Bitcoin is a coin with mining. Well, now the central banks are going to start printing. I don't think it's necessary.