Judging by the current development of the industry, banks are not interested in the use of blockchain technology in their processes, so merger is out of the question. But external regulation and mediation is exactly what the banks want.
Why do you think so? Perhaps it all depends on a particular country, but over time, technologies such as the blockchain, some banks and many institutions show interest, but deny the acceptance of the cryptocurrency themselves. This is quite reasonable, given that new cryptocurrency-related technologies can improve workflow and the use of information in various sectors of the economy and the banking system.