Nice point.  While the government of a country want to be in control of the currency of it's citizens, or the currency altogether, that applies well.

A government that protects its own interest rather than the interest of its people does not want to adopt bitcoin, that is what we see in our world.  The people, however, have their interest inversely proportional.  It is about who will benefit.

There is a difference between a country and it's administration.  Only should the people be responsible enough so that an administration would need act accordingly.

For example, the US constitution is bases on the principle that the government should be as limited as possible, while freedom AND RESPONSIBILITY belongs to the people, e.g. free to act stupidly and get hurt, and responsible of keeping the government limited, among being responsible for their security and everything else in their live (vs other's life)

The United States is now far from that, and the eurozone has a growing "shifting potential", economically speaking.  It is also in my opinion that no instituted government would adopt the currency; only people could.  People who live in a country.