I am not really worried about banks, those are some of the oldest institutions around the world and they know very well how to play the game, they understand that they will need to adapt to this new development, but before they do they are going to try to eliminate cryptocurrencies so they do not have to compete but if they can't then they will reinvent themselves.
Yeah, the truth is that they have been through thick and thins, as well as adaptation to evolution over the years, and I do not see this shaking them into a hideout in the long run, as they most definitely will find a way to at least get to adapt to the way things are changing pretty fast.
I am sure they already know a time will come for them to realize there is so much to gain from the new world that is coming and as long as they are able to keep rendering a service within this space, which I believe there always will be, then, I am sure nothing will stop them from at least making the best of it.