Yes. But banks need to attach a coin to the blockchain, most likely bitcoin.
No need! Coins attached to blockchain is for the aim of incentivise the miners to secure the blockchain. Banks has being making a lot of money and could save a lot of cost from applying blockchain technology.
why wont banks be excited for anything ?
banks just find a medium for them to be a source of income . in order to earn some money they can do anything.
and since bitcoin is growing day by day , it can be a perfect target for the banks to acquire bitcoins and mange a transaction via bank so that they have some commission in it too.
IMO banks wouldn't adopt bitcoin directly and will compete with it. Coz bitcoin is independent decentralized system without the third parties.