In every business it's the same. When new technology comes up the existing businesses will evolve or die. And obviously new businesses will also rise strong.
Same happened with mp3 and music industry...
In my own opinion, banks will never die and it will always exist because not everyone is capable of earning cryptocurrency and most of the people still prefer to use fiat but maybe in the future bitcoins and other cryptocurrency might dominate globally if they will be legalized on different countries.