I think the future of the bank will have a blockchain technology that develops payments into cryptocurrency and will reduce the use of paper currencies because all payments will use digital currency methods which prove to be more efficient and can improve the economy of the country.
Banks won't reduce their part of the financial market, even if banks will take blockchain as a general part of their technology it is likely that we will also be paying commissions to a bank as before. Banks won't become decentralized, it always was centralized and in the future will be centralized. But, maybe we will see something like an open-source project where won't be centralized control and additional commissions. I hope.