I think banks really don't have any issues about blockchain technology and we have seen a lot of people from financial sector praised it, it is just that those decentralized cryptocurrencies who relies on blockchain tech is a threat to them. Well this is true that blockchain can enhance or improve the banking system and add more security to your bank accounts, it can also help banks to make faster and accurate international transactions. I also think that it can reduce the fraudulent activities that is happening inside those financial institutions. It will be big if banks will be able to implement an appropriate new banking system with blockchain.