Bitcoin being an E-curreny can't make bank dissappear; for one thing, here in our country Botswana, we get alot of power cuts, relying on online currency is a really bad thing. Its best to know that you have something physical to use even if the whole world goes internet dark.
Yeah I totally agree with you, the existence of bitcoin which is online currency doesn't have anything to do with the existence of banks. I mean bitcoin is a result of the development of the internet, which is something quite unstable, so how can it make fiat money, which plays a major role in our life to keep us living. So it's impossible for bitcoin to replace what has been irreplaceable.