If you think a country can run their economy without a central bank and the government,I think it is a mistake.We need a central authority.Some people in some countries they do not know anything about the Blockchain technology.Like those people how can they do transactions? We need to educate those people about the Blockchain technology.But it seems it not happened.We can see Some countries banned cryptocurrency and all the transactions related to it.I think crypto is not to ban it should be to develop.
I also don't agree that we don't need a bank anymore. ofcurse we still need the government and the bank, because without government, there is no stable society, and no law for protections for the citizen and the inequalities between the very wealthy and the extremely poor will never have a solution.