I think for bitcoin to be a real currency, government have to accept it first.
So I ask what country do you think will recognize it as a currency?
I do not know yet the country that completely legalized bitcoin. There are countries that have adopted it and vice versa prohibit it. The closest thing to this I think is Japan, progress there is already very fast and in the next 5 years I think everything will happen.
Yes Japan may be more dominating bitcoin after china and maybe they are more potential to declare the legality of bitcoin as the official currency in their country, maybe for the next few years will surely increase the countries adopting bitcoin, so this is certainly very influential on the progress of bitcoin in the future.