Banking is closely related with government. Block chain may be used in banking but I don't think it can kill
Rather they will adapt to the blockchain itself, stay with their traditional banking or create a new technology that will surpass this technology.
I don't think it's going to kill traditional Banks, blockchain because the chain of traditional Banks can adopt completely block technology, so they will continue to develop the business, if the bank does not accept blockchain, then the bank will be eliminated in the future.
If the blockchain will be the innovative future system for monetary and other forms of business as we cannot tell if there is a possibility that this will be adopted in the near future, new ideas and changes are always subjected to our technologies and systems we cannot stop the evolution of technology, there would be a much better technology than the blockchain.