there is a possibility that banks will receive crypto exchange, but it is very difficult because there is a need for regulation to ensure that security is maintained. because all this time the bank always needs identity and personal data, it is in contrast to cryptocurrency system that does not require identity and personal data.
I agree with your opinion that it is possible for banks to exchange crypto could happen, but it will be difficult because of the need for government regulation then also need the completeness of self data, this will change the nature of decentralized crypto become centralized, I think it is very difficult to happen especially to countries that have not provided regulation