Why do you draw this conclusion? The fact that this is happening now does not indicate anything about what will happen later. When Trump takes office he will appoint a new attorney general, and they can pass more privacy-friendly legislation.

Obviously, if any mixers are used for massive money laundering they will go after them but with new legislation they could go on to be recognized as legitimate sites. Automated laundry sites are legal even if in some cases they are used to launder money, and, in fact, the concept of money laundering comes from them. But they are legitimate businesses however much a few may use them to launder money.