Outside of El Salvador, I don't think any developed country will accept bitcoin as legal tender, it's almost unlikely.
El Salvador is still a developing country.
It has to go from small nations, developing ones to middle and large nations.
So far there are only two countries where Bitcoin is legal tender and they are all small nations.
Legal tender countries.
El Salvador and Central African Republic.
Small countries with small economic sizes are more flexible with their national policy changes than big countries but I am very bullish that the mass adoption trend will continue.
Perhaps you are not up to date with the bitcoin situation in these 2 countries, El Salvador has started to profit from its bitcoin investment and domestic bitcoin adoption is still limited, they need more time with bitcoin . But the Central African Republic has announced that it has failed with its plan to legalize bitcoin because of the many challenges involved. As a result, there is only one country left that accepts bitcoin as legal tender, and since the debacle of the Central African Republic, we have yet to have any more small countries accept bitcoin as legal tender.