Believe it or not, bitcoin is international currency from beginning. I don't see that bitcoins can belong to any country more then to others. I'm not so long into bitcoins, but as I see here there is people from all over the world. That is international, without any borders.
Bitcoins are used in all world, and whrn right time come people will be able to buy almost everything with bitcoins without exchange coins first and lose money on transaction fees.
It's my opinion, and I think I'm right because bitcoin doesn't have state of origin. Bitcoin belongs to all of us.
Yes, you have your point, bitcoin has already been used internationally but I think the OPs idea was to have bitcoin accepted officially in every nations, every countries and widely used by every markets, every shops just like some popular payment processors.
Indeed bitcoin is already in use in some countries (International), but use the bitcoin does not yet have a definite law or legal warranties are good in using it. And has not been officially accepted bitcoin in terms of currency and transactions, so the bitcoin can be categorized something illegal. But it's not a barrier to foster a bitcoin get better again, because I'm sure in the future will be accepted by all of the bitcoin among ocessors.