No, I do not believe that. We must admit that what has allowed banks to acquire so much economic power is their ability to understand where capital is, and make the necessary efforts to keep it.
Knowing that banks will never fight against capital, what I see today is a growing interest of banks to incorporate blockchain technologies into their processes, and because of their marked interest in taking over everyone's money, it would not be strange that in the near future we will see banks willing to accept cryptocurrencies to carry out financial transactions.
I do not believe as well because crypto currencies could lead to additional income of the banking institutions. The banks may offer cryptos as their product they would just need to strategize on how the banking industry would embrace and cope up with the crypto market.
I agree with you here, and now even banks are studying this blockchain technology on how they can utilized this and incorporate in their system. I think there are more banks that are studying and open on ideas on cryptocurrency and its a matter of time that they can come out their rulings.