While banks have many negatives it is incorrect to say that they do not bring some positives. By acting as an intermediary they facilitate numerous transactions that otherwise wouldn't happen and this stimulates the economy. The most obvious one is how they use savings to facilitate loans.
Regarding on your statements, I wouldn't agree that banks will disappear, you know why? due to in some other way bank I think still needed in our generation time now. Honestly, I don't trust any bank, but hard to say I still need it now for some other reasons. It may also be right that most banks don't trust crypto/bitcoin as well, although in the near future there is a big possibility that crypto or bitcoin can able to surpass all bank companies, but in a terms of they will fade away, of course not, probably possible they will adopt it. Like in the quotations said that
" If you can't beat them Join Them ".