In the future to prevent crypto mixers from troubling the authority they will increase the time to do some background checks on their customer. I'm saying this due to how abusive leads to KYC in crypto casinos.
That defeats the purpose of mixing, they have to trust the mixer in case they ask for KYC will they do because, in the first place, they use the mixer to anonymize their identity and they will also fear that the mixer will hostage their information.
If one mixer will do that background checking the clients will just choose other mixers that will not do background checking, we cannot change the business model of the mixer that's how they worked and that's how they are being patronized.
They are here to stay if authorities go after them or consider them illegal they always have the darknet to turn to.