Well, i just thought, if bitcoin become a currency of one Country, maybe it can destroy that country? Think of it, Bitcoins do not have a tax, and tax are used by the government to make that country a good one, without tax, what will be used to spend and make that country a good one?
What do you think?
Definitely it's not possible in the nearest future. It's very difficult to control Bitcoin therefore the government will not allow it to become dominant currency.