Banks have nothing to do with xrp and can not work with something where price yo-yo's all over the place.
Banks don't like public open transparent transactions.
Banks need stable price thats why they create there own blockchain Corda with over 200 banks supporting it with the likes of: Bank of America, Merrill Lynch, CITI, Credit Suisse, DBS, HSBC, J,P,Morgan, MUFG, OCBC, Standard Chartered, UOB, SGX, Monetary Authority of Singapore (MAS)
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R3 and Ripple Inc in court over the sale of Billions of xrp for the real price of $0.0085 per xrp which the bank-consortium then resell to gamblers

Central money producing companies like Ripple and Liberty Dollar end the same, Liberty Dollar operated for 11 years.