I don't think that Bitcoin can make banks disappear. Because in my country there are more to be educated about the internet let alone Bitcoin.
So am sure Banks won't disappear but Bitcoin is here to stay.

Neither banks nor bitcoin will disappear in future as both are the long term players and banks has already proved its power since it exists since long time and it also has large number of users bitcoins is comparatively new but will gain more popularity and users as time passes by.
and bitcoin bank may only be a competitor. that is, either will not be easily replaced, because it has been reliable for years and provide benefits for its customers. while bitcoin is a new thing for the community. but, when the bitcoin has been popular, it's probably not going to make the bank disappears, but of course bitcoin will be a contender for the bank.