I do not think that at the presence of bitcoin bank will disappear. Even many people predicted that bitcoin is the new face of currency or currency of the future, we can not say that it is intended to remove bank in the future. Why? Because the great people and government behind banks will not allow that to happen. Banks are their source of living and bank is the reason why they become wealthy. So, they will do everything to sustain it. Instead of thinking that bank will disappear in the future, maybe it is more reliable to say that in the future, bitcoin will be the partner of banks in controlling the circulation and distribution of crypto currency. If ever that the prediction of one world one currency will happen, I guess still bank exist by then.