I don't believe any country will adopt Bitcoin as it's sole currency. What is highly more likely is each country will create their own, as a few already have started doing. Perhaps after that, a new global coin will be developed that may or may not incorporate the values of the other currencies. Only time will tell and it is definitely going to be interesting!
If the government can't accept bitcoin as legal currency it is impossible for bitcoin to become national currency. In my view bitcoin have no intention to ruin the people who believe them. Because if this crypto doing it more capitalist were quit their investment and bitcoin was suffered in digital industry.