It depends on the way you look at it. If you want to leave without bank what if criminals hack into your wallet, what will you do? if it’s an exchange you will complain to the support team. They are also acting as bank too. Bank is very necessary and i don’t think it’s possible. Also consider the people that are less educated the bank also help in educating people in some basic things. I think the only thing that can happen is that, people will just shift the attention to cryptocurrency but not to eliminate banks.