There are some people in crypto community who are believing that blockchain will replace the current banking systems. However, all their basis is the concept of blockchain that hasn't been made to its potential. This is my reason why I believe that blockchain won't replace banks.
It hasn't been made to its potential due to regulations that pose banks and there are huge barriers for a big portion of the society that cannot access the cryptocurrency community.
As long as banks will find their way to implement the blockchain technology to its banking services that it is for sure that blockchain banking will be on top of anything. Same happened with Internet Banking.