Probably if a country make their own cryptocurrency, they are going to support it as it is supported by the government. But I think that this will not going to happen because many countries are not comprehending what is the value of cryptocurrency. If they can't accept bitcoin as a currency even now, then it is very hard for them to make their own cryptocurrency. I think the reason is that their mindset of crypto is just a full of scammers compared to fiat currency. Government around the world are not open-minded enough when it comes to blockchain technology so that they aren't going to digitize money as long as people are still supporting the use of fiat currency in their everyday lives. Let bitcoin be bitcoin because it is the basis of all cryptocurrency invented.
Believe it or not, the Government is going to introduce digitized currencies even if they don’t accept Bitcoin as legal tender, in order to exercise more control over us. With Bitcoin, Government lose control over us and no Government will want that. But with digitized fiat currencies, Government gain more control over us as they can track digitized currencies better than Cash.