I don't think that they will want to stop it for real. They are mapping and matching real identities with the addresses and thus can conclude who moves money where. As it is transparent it is good. With increased demand they can't easily stop this as they are not that much naive to think that crypto can be stopped. I do believe that they are aware that they can't be in control over it and this is why they are seeking and looking for ways that they can sue to regulate it.