All countries converting to cryptcurrency means a good news to the entire crypto market. The market will see full green for a long period because there will be an increase demand as users trade with the various coins on the market.
When countries accept cryptocurrency people will put their money in it without any fear. Converting of governments means converting the whole nation into cryptocurrency. The use of crypto will increase by this way and people get more chances to enhance life standards of their families. People will be happy while using cryptocurrency instead of paper or fiat currencies.
Why not, every country can switch to cryptocurrency fully because if we can travel from barter system to digital cards, we can also go one step ahead towards digital currency. It will take time but in this time we cannot imagine the atmosphere in the future. There are many things in the world which were impossible 100 years ago but now we are using them.