Some banks are considering adopting blockchain technology in their system. I recently saw a news about some loans paid through bitcoin for faster transactions and since they want to take advantage of this too, they would want to create their own cryptocurrency. Although some banks are against the idea of cryptpcurrencies and some even terminated the account of some holders to whom they know is involved in crypto, they just cannot easily get rid of it and the solution they can think of is to create their own cryptocurrency but still a centralized one.
I believe that blockchain technology would be the norm in the future and those who stay in the old system would be left behind and they would eventually shift to blockchain. A blockchain need not be public anyway as there are private blockchain so it would be an advantage to them. It is a big help to track those transactions real time especially for those financial reports wherein one doesn't need to accrue an expense and doesn't need bank reconciliation anymore at the end of the month since transactions are up to date.