No, any country that takes bitcoin as a national currency will very quickly regulate its economy due to the fact that bitcoin has very high volatility. I also believe that the amplitude of fluctuations in the price of bitcoin with an increase in its value will only increase. On a small example I will explain that if, for example, you then go into the store, in the morning a certain product will have one price, another for lunch, the evening of the third and so on every day. At the level of management of the country's economy, this will generally be comparable to a catastrophe. Planning the economy of the country, as well as controlling the implementation of plans for economic development of the country will be impossible. I'm not talking about the risk of depreciation bitcoin at its high cost. Therefore, I do not think that any state will decide on such a step. In addition, it should be borne in mind that if the state takes bitcoin as its national money, then it will largely depend on the state of economic development in other countries where bitcoin will be used as a means of payment.