the governments were completely blindsided by bitcoin, they thought they had perfect control and monopoly of fiat currencies and then bitcoin came and erased that notion, at first they thought this was never going to get big and it was just a form of money for nerds
Another option would be to choose to accept it as a legal tender but that would only happen to a small country like El Salvador that has used another foreign currency so it would be easier to use another currency as their legal tender
I doubt that we are going to see more countries accepting bitcoin at the moment, not because there are no other countries interested in bitcoin but because they are going to wait for a few years and see that if the experiment we are seeing at El Salvador is in fact successful, if it is and I think we all hope it will then those countries will begin to adopt bitcoin.
but now they are realizing bitcoin is a real threat to them and yet despite doing the best they can there is no way for them to stop bitcoin.
Actually this only happened to some super power countries such as China and US because they have their own fiat which is used worldwide so bitcoin poses a thread to the whole economic system of their countries. Most countries so far are pretty neutral to bitcoin existence so there is a good chance that this might continue on the future
Those other countries may support bitcoin now because they want to weaken both the US and China, but you can be sure that if it happens and they are the ones that are at the top they will quickly change their tune.