Although there are a few countries who uses bitcoins and other cryptocurrencies now, I cannot help but wonder if the world is truly ready for this digital currency? It will certainly be hard to replace all currencies in the world but it could happen in a decade or so, perhaps even less? Still the question is, is the world ready? I think if this happens it might be one of the biggest changes that will happen worldwide.
I think it's going to take quite a bit more time than most people think. I'm on a 50 to 100 year timeline. There are too many people that are older and less tech savy that just will not catch on. These generations need to bow out peacefully in order for the new order to take over. Once we have enough people in agreement/able to use/or has mastered the learning curve, then the world will be ready. As for now, don't hold your breath.