To be honest, banks tend to build their own stuff instead of using 3rd party solutions. I'm thankful they at least use Microsoft Office in their computers!
For example SWIFT was developed by banks for the banks.
For this reason, I don't expect a crazy XRP adoption by banks, at most I'm expecting some trial usage and if they like it, they'll create their own, centrilized blockchain instead of using a decentralized one like XRP.
Personally I'm seeing value in FinTech companies which seems to be choosing XRP so far. More and more collaborations are being announced and that's great!