Banks will change or go under but they won't go away. They will always find some service to provide that someone else will want to buy.
Crypto currency, including bitcoin, can not completely displace and destroy banks. Commercial and state banks are now adjusting and are also starting to buy and sell the Crypto currency. I know that at the same time take a commission of four percent or more. It should also be taken into account that some part of the population will never ever use crypts