When we were both JWs, my husband became a very infrequent meeting attender. While they would sometimes ask me to "say Hi," the harrassment (phone calls, requests to pay a shepherding visit, etc,) didn't begin until I became infrequent in field service.
My husband is an introvert, was rather quiet before and after the meetings, and had no significant ties. I am, however, very extroverted, "well-connected," and was fairly reliable until nearly the end of our time there. When the elders have called over the last 4 - 5 years, they call me. While I understand this is common practice - to call the wife and appeal to her "emotionalism," it isn't particularly effective around here. The last person who called was told that if I explained why I wasn't involved, I was aware he would not "help" me, but rather convene a Judicial Committee. He protested that it wasn't so, and I let him know that I was quite familiar with Organizational Procedure (where's that little TM mark, lol!) and that I found it hard to believe what he was saying.
This was the second such conversation I had with the same man in the same year (C.O.,) so I don't feel too threatened, HAHA.
But I think if my husband had quit and I had kept on, there would have been very little action taken. It really depends on the couple. It's not that I was "so special," simply that I am the more "visible" person in the couple.