It can never be happen that bank will disappear because of bitcoin, but bank can be possible to adopt the concept system of bitcoin in the near future.
I have different oppinion, I think bitcoin can reduce income of bank from fintech. Bitcoin transaction is more easier. So I think a lot of fintech industries will choose bitcoin. Probably if the customer of bank turn into bitcoin, bank could be dissapear one by one.
Banks have understood that they can't just ignore fintech companies. Because of this, they're trying to cooperate with them (if you can't beat them join them) so they are searching for the best fintech ideas and they're buying them (the idea, the person or the entire fintech company). Banks has funds to work out the fintech ideas, has the customer base, to test them and the most important, the trust from the customers. Because we're talking about money (fiat or btc), without trust, the best ideas can just disappear easily. Banks has the customer base, and customers trust their banks. If the bank starts a new service, customers just don't think about he trustability of the service (because it's the bank's service) but only if the new service is useful for them or not, and if they find it useful, they will use it.
If you're a fintech company without any reference and customer base, you have to work hard, do marketing, collect customers and funds, if you have only the idea and you are short on funds.
It seems that at last banks has understood that fintech is a thing that they need to think about, so they won't disappear, but their service will be better because of these new ideas and technologies.
