If you are talking about ordinary banks, then I would have said that there is a possibility. But central banks are mentioned here and they are an essential part of the government system. If you kill the central bank, then you are destroying the government's control of the economy. I am not sure whether any of the regimes would allow that to happen. And in case that occurs, then there will be complete chaos and anarchy. This is like uncharted territory, and no one knows what the situation will be like without the central banks.
Therefore, this cannot even happen theoretically. Bitcoin and other decentralized cryptocurrencies are incapable of causing significant damage to the banking system. Cryptocurrency and the banking system as part of the system of state power must coexist, and this is primarily needed by the cryptocurrency itself. If we assume that the cryptocurrency will pose a threat to the existence of banks, then the states, of course, will not stand aside. They have very strong levers of persuasion and coercion, and in general, states are capable of destroying anyone who encroaches on their system of organization. Therefore, nothing threatens the banking system. It has existed and will continue to exist.
