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
Its not gonna happen, There is already many business project using ripple as payment from what i know ???Ripple already adopted by few banks to be used to transfer money