I personally cannot even imagine our world without the national currency of states. To have an idea of the value of a cryptocurrency, it must be compared with the value of objects in the world around us. If there is no dollar, euro, pound and other currencies, how will we express the price of bitcoin? We'll have to then in cows, horses and so on. For example, one bitcoin will cost 10 cows or 7 horses. However, after a few hours or even minutes, bitcoin may already be worth 10.2 cows or ten cows and one rabbit. What if you don't need cows and rabbits? You can, of course, evaluate everything in ounces of gold. However, then it is necessary for gold to really go. And in order not to constantly carry it around with you, they will again come up with safe and promissory notes, which will lead to their highest form - paper money. Want to reinvent the wheel? Or do you think that all previous generations of people were stupider than us? Therefore, cryptocurrency can only be traded with the currency of states.
Well, the market price of physical goods is not a constant thing and also has a tendency to change, because this is the essence of the market and market relations and the price in bitcoins changes hourly, because the final price of physical goods is still expressed in Fiat currencies
I absolutely agree that the national currencies of States will continue to live and live despite all the revolutions of the digital world and can only change their shape, but the essence will remain all the same. No normal and strong state will put its fate and its monetary policy in the hands of developers who have nothing to do with this state.