.                I think  not all banks Will disappear if just in case that Bitcoin Will rule the world of currencies . Banks still have their  role in the community  through them, there is local exchange currency. Just accept the fact that every country has their own currencies  and that is a part if every nations history. We can not erase them totally, they the one that keep them , the local currency. If ever, maybe banks Will study some aspects of Bitcoin and that to broaden their kind of services towards people.