The bitcoin is the future of all currency's because everything is gonna be digital plus it now already has a step ahead on other currency''s.
I agree thay bitcoin is already a global currency. why? because when many people around the globe use bitcoin, it means that it is global currency. besides, many countries now accept bitcoin as a currency. so no doubt that bitcoin is global currency.
Even though we are still not even 1% of the total world's population but I can see that bitcoin will be a global currency since its users are found in every region of the world. And that is making bitcoin more popular because we can simply use it no matter where you are in this world as long as you both are accepting and using it, it doesn't matter.
You have the point with that but the thing is bitcoin now being used by considering millions of users all over the globe. What you are expecting? Maybe you are wanting that bitcoin should be accepted first by all the people in the globe before it can be called a global currency? Bitcoin is already going there to be come a global currency a little by little.