Several things strike me about the article. First of all, the model for church discipline is not public humiliation, but repentence and reunion. The three steps in Matthew are go to the person yourself, then take a person with you if that does not work, then let the church body handle it. That is hardly public humiliation. This being an elder rule church, the elders should have handled it privately. If in fact their mindset is to humiliate and not encourage repentence, the the elders need to be removed from office.
My next question is how does the church know she is having an immoral relationship?
Donna, as to your question, our church has a policy in writing of withdrawal of membership after one year of non attendance and support for one year, with execptions for military, college, medical reasons, mission field, or living away temporary on some type of job. In practice, we have only removed from the rolls non-resident members after decades of absence. Resident members who do not attend, which is about 65% of the roll, we have barely done anything about. Again, each local church must decide their own policy on attendance.