The current trend of blockchain is very high, couple with it's ability to execute millions transactions within seconds, few transactions cost and no third party is require or paper signing. All transactions recorded and kept open, taking alway cross border and languages barrier, excellent in e commences. So many features to change the world. My emphasis is can blockchain has the capacity to replace bank?
Banks are far different from blockchain, banks are an institution while blockchain is a technology, you're asking the wrong questions here. If you ask if whether in the near future if banks would use blockchain tech, maybe, there's a high possibility but of course, everything has to be regulated first.