If the governments were smart they would start to accumulate bitcoin and other crypto currencies. They can use it to pay off their debts while their currency still has a use.
Maybe your opinion is very simple, but if you think about that there is a point. Why does the government not mine as much bitcoin as possible by using sophisticated tools and collections of geniuses, then the results are used to pay the state debt? While for fiat money remains normal, it is used as a domestic transaction. This digital currency is all possible, because the birth of bitcoin starts from assumptions, so the price of bitcoin will tend to be predictive.