That's not going to happen. As soon as it does, we'll be seeing a crackdown on a wider swathe than just banks. What scares the bejesus out of me is what happens when tooling to link up personal data from data aggregators plus sufficient tooling around blockchain analysis is built such that a realtime tracking system of financial to other activity becomes possible. A full public record of all financial transactions is a hell of a surveillance tool, and with enough ancillary data, transactions are trivially deanonymized (assuming Libra is structured in a pro-anonymity way, which it won't be, because otherwise, banks won't have a thing to do with it.