a business needs an innovation to survive also business needs a adaptation to the current trends in the industry for them to survive also if cryptocurrency will overtake that industry they also need to innovate something or just adapt for them to be still in the market. But banks are still banks many people and businesses still believes on it.
Every thing takes time to change and so will the crypto currency will take time to replace the fiat. When there will be no Fiat, they will be no need of banks so the banks will automatically be closed. Of course banks will not run if no one uses the paper money and the world is shifted to digital currency.
For me, the Futue of banks is not secure.