I have been planning to create this thread for more than three months but today I decided to drop the thread.
When I was a little child, Missionaries like Jehovah Witness Brethren and other Pentecostal Church preachers who was preaching the Holy Bible says, time will come in the whole world that everyone will use ONE CURRENCY and anyone who refused to use that currency can not buy things in any store. And the way BITCOIN is, it is accepting by the whole world. And Bitcoin is growing step by step.
Are you talking about the time when the evil dominates the world that without the mark of the beast you won't get anything not even the right to buy food? It looks like your memory betrays you. There is no such thing mentioned in the bible that Bitcoin will be that currency. and there is not even a mention about the currency in this verse: Rev. 17-18.
[17] And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name. [18] Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six.
It is all about the mark of the beast and not about what currency to use.
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".
Again I do not think that the thing you are stating is all about one currency but rather it is all about the mark of the beast. I also agree that Bitcoin won't be the last currency of the world let alone to be the sole official currency of a nation.