Well Ripple right now could be faster compared to the other cryptocurrencies and crypto assets but after implementing second layer scaling solutions like the lightning network and the related channels in bitcoin, or raiden in ethereum, there will be no problem to handle this sort of transaction volume.

Furthermore there could also be a private chain on the ethereum network if if they really fear about transparency...

Even NEM could come up with a proper solution for the banking industry... but I guess some banks are just heavily invested into Ripple and want to push it to the top spot!