I think banks got disappear since bitcoin gives a lot of features and more benefits than banks. Cryptocurrency are mostly using sending money world wide without paying highly fee where banks applied highly tax and people afraid to paying it.
I don't think so, because as long as people still use the banks, then the banks will still exist. We can see that many banks in all country still operate and run their services, no matter if people use bitcoin or not. Yes, I agree that cryptocurrency helps us to send money to other people without paying a higher fee but still, we need the banks to save the money.
I my self move to bitcoin and close my all banks accounts. I am not willing to pay free taxes without any reasons. The future of bank seems bad.
I think if you can use bitcoin to buy something in your real life, then you can do this. But if you cannot use bitcoin to do that thing, then how can you buy something? Do you use fiat or bitcoin to buy something for your daily life? It doesn't matter if you close all of your bank's accounts but the matter is how you convert your bitcoin to your local fiat if you don't have an account in the banks? Ok, maybe you can use your family bank account, so you can still use local fiat to buy something.