I don't think crypto banks will replace traditional banks, especially when crypto is proven to be unstable at times. Fiat currencies are still relevant these days, so don't expect traditional banks to go anywhere soon. The few banks that are providing crypto services to its customers are only doing it to take advantage of the situation. But that doesn't mean crypto will eventually replace Fiat in the long term. Most (if not all) banks see crypto as a threat to their very existence, so they will keep Fiat afloat no matter what.

Crypto doesn't need banks to survive anyways. After all, Satoshi created Bitcoin to be an independent currency anyone can use worldwide. It was designed in response to banks' malpractices with the mainstream economy (debt, inflation, etc). If BTC was created to fight banks, then why would any bank adopt BTC or any other cryptocurrency in the first place? I'm waiting for the day when decentralized cryptocurrencies beat banks for good. I know this is very unlikely to happen right now, but it could materialize in the future as mainstream Fiat currencies lose people's trust. Rising inflation rates and governments' inability to handle national debt will lead us there faster than you could ever imagine. Who knows what lies ahead for the entire crypto/Blockchain space? Just my thoughts