Banks have to go with the money flow, otherwise they will extinct.
I do not know how they will compete with nearly zero cost for transactions and trustless blockchain technology.
If this is the case, thre is a huge possibility that the banks will have no value at all. We can conclude that it might happen if and only if, banks continusly insist that they havethe capabilities to do so especially to the time where blockchain is on top. But then it might happen soon but not today.