Now many banks have already ceased to ignore the crypto currency and seeing its tremendous support from the public, began to look for ways to approach it and possible methods of using it for profit. Some banks provide services for buying and selling and exchanging crypto currency, in Japan they even try to make a single bank card for crypto currency and ordinary money. I think in the future the range of such services will significantly expand and banks will have to play a significant role in the implementation of the crypto currency in all areas of our lives.
I'm not really sure that this will happen, because banks will implement blockchain based solutions (like bitcoin, but not bitcoin) for the problems bitcoin can solve and banks will sell these blockchain based solutions to their customers. If people will continue to trust banks, and they can choose the banks' inhouse blockchain solutions, they won't think about choosing bitcoin. This is only valid if the mass adoption of bitcoin will be later than the banks' deliver their solutions for the common problems.
Banks have money, and when we discuss about them we need to be aware of that fact. With a lot of money they can do what ever they wish, to create new crypto currency or to implement some existing one. They are profit chasers and about that we all agree, they will try to take the most of crypto world.
They started to take bitcoin for serious they just don't show it, maybe here and there we see some article from some bank director calling bitcoin a scam and nothing more. There are a lot of banks out there, and we can't underestimate their power and their bankroll, what we should do is to hold on bitcoin and decentralized alts, and what ever banks do eventually we need to ignore them and their actions.