The banking system has long emerged. In fact, Zigurats can be an example in historical ages. I don't think they're gonna disappear now. They will probably undergo a technological shift. I think classical banking will undergo change.
For sure Banks will adapt the changes and will add crypto in their option, I don't think that banks will just disappear as we all know how they play in our economy, they are controlling our financial system and once they found out how many people and how much money in the crypto market for sure they will do something for it.