There is a big possibility that blockchain can replace banks. But that may be happen in the next year or maybe century, since blockchain market today is in crisis. Banks needs a stable currency and that needs the blockchain to develop.
That is certainly illogical! I wonder why a lot of people are not even seeing the fact that blockchain and banks are totally two different things. Bank is an entity for saving money, giving loans, investment and so on, whereas blockchain is a technology that is there to help disrupt the way we spend.
Now, I see banks in the long run, adopting blockchain and in that case, banks will still keep finding a way to stay relevant. It can only challenge them in discarding the way things are done in the past.