No it will not disappear bitcoin as banks are not currency with which bitcoin is in competition and the banks will sooner start working with bitcoin as the banks job is to work with currencies and bitcoin is a currency. And may be Bitcoin itself require the need of banks if it took physical shape.
I think bitcoin will not have a physical form because if bitcoin have a physical form it is not suitable for bitcoin always fluctuates, so if you have a physical form will be very harmful because it always fluctuated. Bitcoin better just as a digital currency and I think it will not make banks disappear. The Bank has a very strong financial and could always progressing.