Do you think these banks will simply let their extinction to happen? We are talking about billionaires and strong companies here. There's no doubt, they are learning and have already concrete plans as early as the first blockchain went operational. Banks will utilize the potential of recent technology of cryptocurrency rather than compete with it.
Of course, there is no way that would happen at all. Considering the fact that banks have been in existence, they have all the facilities and technology in space to handle themselves in changing times, they will simply just find a way to easily adapt to the changing times in the long run.
Sure, there is a lot of things changing, and one thing about life is that the same way our mindsets are changing, technology is changing, organizations are changing, that is the same way banks will also have to revamp themselves to be able to get themselves occupied in servicing the new world.