Big/medium banks are never going to use Ripple, theyre only trying it out and will drop it then make their own technology (not de-centralized!)
Blockchain will change how we send money, but not through banks. Theyre completely against de-centralized control of financial system. We need blockchain solutions like Kora (
https://bitcointalk.org/index.php?topic=2876521.0) that are person to person and small business to small business
Banks will never going to support any cryptocurrency willingly, unless they have some plans for it in order to overcome the decentralize strategy that blockchain has. Banks will going to be hypocrite in accepting and adopting cryptocurrency in fact.