yes there is no doubt about this that bitcoin is already an international currency as you can see people in this forum from all over the world.
That is true. However, they say that it is not due to the lack of popularity of bitcoin. It is not widely used as a currency but just an investment. If we are to change that way of thinking maybe it can be said as a true international currency.
We cannot change the fact because we need time to consider it as a proven international currency, we are in our early stage now and we are using bitcoin mostly as an investment for the reason that there are no major merchants online where we can purchase our needs and wants.