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Certain things will remain unchanged no matter the circumstances so regardless of crypto existence and adoption it's definitely will be an impossibility for banks to go on extinction. For instance we need light and thus since the use of the internet isn't adopted, we expect electricity to go on extinction?? Hell now it's never gonna happen. I think alot of patience is needed so the banks can see the advantage and benefits of cryptocurrency and enhance it's adoption.
Bitcoin was created as a native solution that could be used as a means of payment, instead of relying solely on fiat and other payment systems. Bitcoin wasn't created to threaten the existing financial system; in fact, I never imagined it could threaten the very existence of banks, which handle millions of financial transactions every day.
Bank will still exist, even if governments adopt and legalize crypto. Each has its own target market, and this depends on the needs. Not everyone understands crypto, so they will still choose banks, while others who are dissatisfied with banking services will turn to crypto for a better experience. Banks and crypto will coexist, that's what the future holds.