I don't think banks will disappear because of cryptocurrency because many are used to it their savings are on banks and some didn't even know about digital money. I think banks and crypto will coexist and it's better because people will have many options they can choose a centralized one which is bank and the decentralized one which is cryptocurrency.
Banks will stay and will continue to grow, crypto is making things possible to lessen the transaction fee compared to bank but we cannot
deny that we still need banks as majority of the people still trust bank. We are too ambitious to think at this stage that crypto will beat bank, because
crypto's success is still not bigger than bank or cannot even compete.