Yes, I really don't like the idea of having a bitcoin bank, when bitcoin increases we can't expect the real amount of the value of bitcoin, it is better to store them in our btc wallet and wait until it increases so at the same time we also earning while storing our bitcoin in our btc wallet, unlike in bank. We don't need btc bank at all.
That makes no sense since bitcoin banks surely will work just like any other exchanges work. When the price has increased and you're withdrawing your btc to the banks through ATMs (fiat money), then it should cost you lesser bitcoins since they will be following the buy/sell rate. It would not make sense at all if bitcoin banks only store your bitcoins and nothing else. Because what's the purpose of the physical bitcoin banks that they have.
Bitcoin banks surely will be fiat and bitcoin together. You can withdraw your bitcoins as fiat and vice versa. If it's just fiat, then it would be just a regular bank. But if it's just bitcoin, then their "bitcoin bank" is pretty much just a bitcoin wallet just like electrum. They have to combine the two to have sense.