It is already a international currency as majority of people across the globe are using it, the only thing we need is that it should hit the mainstream to get more popular in future.
It is true that bitcoin has become an international digital currency. But not everyone knows what bitcoin is, Because lack of knowledge about bitcoin makes people less sure with bitcoin. Nowadays bitcoin is popular, but there are still many people who are out of date and don't know the information about bitcoin.
If we look at the capabilities of bitcoin, then well get to know that bitcoin is very much capable of becoming an international currency.
Moreover, if this thing ever happens then things will change in a significant manner. It is because of the reason that bitcoin will be used by number of people and it will for sure help all of them in having as much amount of money as they want to have in their lives.