That basic interest is stronger than just pure monetary power, collectively,,, this is why Zimbabwe and Venezuela have not abandoned their currencies despite it practically being useless:)
These countries or other countries that have had their Fiat devalued to the extent it is looked as worthless would not abandon their currency because of the role that money plays in the system. If you Google that information about the role of money, you are likely to get these:
Unit of account, medium of exchange and store of valueThat means the Zimbabwe currency or that of Venezuela has those functions still. Most importantly, they are used for exchange and whichever that will replace it has to play that role effectively and I don't think bitcoin or cryptocurrency has taken that spot yet in such less developed countries that are still considered high in the level of illiteracy.
I have to also add from my view that Fiat is a unifying model for the econony and identity , where government runs on digital currency at most, it still will not take the place of Fiat/paper money.
I did say it was about identity, which is to me the most important, you can Google all the information you want, but I met many zimbabweans students from our local universities who only bring out their currency to give as souvenirs to people (because it is printed in millions and billions) and laugh about it. They tell us that Zimbabweans only use US dollars. If they accept local currency they will ask for 10x 20x what the actual price is and nobody wants to carry a backpack of dollar bills to pay for coffee. They have those functions but only because the government says it does but on the streets everybody pays with US dollar.
I was not talking about them using Bitcoin to replace it, I was talking about most fiat currencies being held on to by states because of national identity not so much monetary power.