I think banks will always exist even though many people know crypto and are widely used everywhere, but crypto still won't replace fiat, but most likely banks can adapt to crypto, so bank products can be side by side with crypto
The bank can exist by adapting the new tech. Crpypto can be easily adopted by the bank if they want. People are always talking about removing the traditional bank while they will always need fiat money if their environtment has not supported yet the cashless transactions.
It's still making everything much more easier when it comes to the our real life.