I think that the bank will eventually accept the reality and accept bitcoin in a transaction to make fiat.
Bitcoin will continue to grow, slowly the bank will accept bitcoin and will have its own altcoin and will later create a community by attracting customers or customers. As time goes by it will definitely happen.
Also, seeing what Ripple - the bank's protector - did, it's possible to assume that the most powerful banks will create their own crypto and then manipulating it the way the want. In this case, even btc investments isn't needed. A simple and genius scheme, really. With banks' power, they can easily promote their coins and take advantage of it. It may become a great scandalous of a global scope, but who cares?!