It is not that I do not believe in bitcoin to be on top of all currencies over the world but I guess, making bitcoin as fiat one to be a future money I guess it is a bit hard to imagine tho the fact of many now are involving into bitcoin, but we must also look to the point that it is still inside of the computer where not all of us can access any time then.
And not all country allows bitcoin to use it as the transaction method to pay things.