It is not a international currency yet but it definitely will be in the future. Because bitcoin has become so popular almost everyone i know already invests in bitcoin or just knows about it. I even think that there will be paper bitcoin.
Bitcoin will be more helpful for the development things all across the world and those who are opposing that it cannot be the world currency will see this happening in the future because it is the most profitable coin of all the time and more of it, it is accepted all across the world and after 5 to 6 year whole world citizens will demand about this and that time will be golden time of the bitcoin.
It may be just a time factor to make bitcoin as an international currency, because we know functionally bitcoin has become an international currency as it proves to be accessible and used in every country in the world, but for now the legality is still a consideration for the government to legalize bitcoin .