I think bitcoin will be became more successful and it will be used as a global currency in the world but we can not be sure if bitcoin will grow big worldwide because other countries ban bitcoin. Bitcoin is very complicated thing and it is very risky. We all believe that this will have a brighter future.
Bitcoin is already a global currency because anywhere in the world, you can use bitcoin but the only thing that we are waiting is the approval of the governments from different parts of the world to make bitcoin as a legalized currency since bitcoin is risky and volatile so the government are not yet fully making bitcoin as a legal currency but soon they will.