There is so much blockchain hype at the moment, and this is my thought too. There only rational I can come up with is Bitcoin was the kick in the pants banks needed to realise they can go from 30 year old technology to 10 year old technology.

What Bitcoin solved was decentralized trust. I don't see any banks replacing their existing 'trust' network with code, they'll want to reverse transactions and mistakes, and will also want a veto over any distributed ledger.