While it is good news for Bitcoin users/hodlers that countries allow the use of Bitcoin as a means of transactions within their border, what will be your position if a country decides to take a step further by using Bitcoin as its national currency?
No country will use Bitcoin or any other cryptocurrency as a national currency. First, the nature of crypto is decentralized, meaning no single entity can control it. Most national currencies has features that represents that country, like flora and fauna and famous people from that country. It's currency must be physical, and its value depends on the USD or gold, which is not the case with a crypto.