I don't see how banning payments would inherently create more opportunity for ransomware attacks. Assuming that the operators are already attacking as much as they can (why wouldn't they be - its more profit that way since its business after all) the only way to maintain profitability with lower per-attack yields would be to ask for more ransom per-attack which would likely drive the yields down even further.

Reminds me of https://youtu.be/9pOiOhxujsE?si=GG6X16c8efr0I3Ey&t=213