I think the days of online mixers will be over soon as all owner/operators will be worried about being arrested because it is impossible for mixers to stop their websites and businesses being used for money laundering. If money laundering (or alleged money laundering) takes place the authorities will be out to arrest the owners therefore they should not be involved in that line of business.
Multiple government agencies have sent out a signal to mixers after what happened with Chipmixer, sooner or later their owners will face arrest under multiple suspicions and allegations of crime including money laundering.
I wouldn't be so extreme.
Just look at what happens to Torrent sites, that despite some being arrested and convicted, these sites still exist.
I believe that the way of operating will change a little, to give more security to the owners. And be careful not to get them too big, because that's the problem.
They can, for example, create a ceiling limit per user. Or a global ceiling for the platform per day, or per week, or per month.
Of course it will be a type of service that will change, but it is part of the evolution of time and the growth of the network.