I don't know in the last step of Bitcoin everyone will only use it and no any other currency will exist again. So I like to hear from some Biblical Scholars in the forum to tell me more on this topic. This thing that I said is inside the Holy Bible but I can't recall the scripture but it is in the book of "Revelation".
Theirs some certain things that we know that can not come into existence because we know that Bitcoin is new currency that's not up to thirty years for it existence and other currencies has come to board before Bitcoin but they could not stand so i know that fiat currency will remain the captain of other currencies, from my understanding concerning Bitcoin I have not think of Bitcoin of dominating other currencies because it's a technology and a higher technology can come up today and pick up and dominate bitcoin technology, so for now fiat currency still number one.