I would not be surprised if Altcoinstalks owners/operators take a similar decision to theymos with regards to banning mixer but it seems highly unlikely now for two reasons. First is because the so-called crypto friendly US administration are making decisions. Second is because if they wanted to ban mixers they probably would have done it around the same time but they did not. As a precaution, the owners/operators might consider a ban on mixers or at least keep their options open.
That site wouldn't have any active users if not for allowing them to advertise mixers after Bitcointalk banned them.