You are wrong. In order to destroy bitcoin simply to strengthen governmental control over Fiat money. This is the weakest link in the chain of bitcoin. Now, there are no conditions to bitcoin existed independently. Every user is compelled to exchange their coins for Fiat. If banks are banned from such transactions then bitcoin will lose popularity.
I am not compelled to exchange for fiat. I don't want fiat so I only use bitcoin. If I can't get it for bitcoin then I don't need it. There is nothing that will change my spending habits now and I'm not asking for permission to use crypto, I'm telling the banks that I will.