BTC cannot be like other national currencies. But that is what makes it stronger and unique hence cannot be manipulated for corruption and other similar evil activities.
Dont be that pessimistic dude. There is nothing wrong in making bitcoin the national currency of a state. Bitcoin is not only a currency but also an investment. This is what makes it stand above all conventional currencies. Bitcoin has changed lives of many worldwide and helped them living a peaceful life. I dont think so a state that would make bitcoin national currency will suffer in any way.
Bitcoin as national currency can in fact being a great revolution for the people living in that country. There is nothing harm in declaring bitcoin as the national currency. The only thing that matters is the interest of the government. If the government is willing to take this step, then I think this will help a lot in making the economy of that country better.