That isn't true. There's many cases where e.g. through corruption and distrust, the state's capacity to collect taxes has been seriously weakened and the curren

That isn't true. There's many cases where e.g. through corruption and distrust, the state's capacity to collect taxes has been seriously weakened and the currency has gone into freefall so the country begins to operate - even despite threats of harsh penalty - in alternative currencies. States regularly remain in existence (i.e. are not overthrown) even after their currencies have stopped being used for everyday transactions and as regular stores of value. It is one of many examples of governments playing catchup with the economy.