Great OP and Also WTWIzards comments.
IMO. There are three essentials that stop Watchtards from breaking away.
1. A certain comfort level they have developed within the village despite CD. The false sense of security ( from the wicked world) among their'loving' brothers and sisters coupled with the exclusivity that goes with their retarded mind sets programmed by the mind control, doctrinal mumbo-jumbo . Some are so dependent on people within the organization that they will not interact with anyone else outside the org. A few yers ago one Eldub told me he was getting his taxes done by a sister who was charging him $350. This guy is a retired carpet cleaner and he and his wife get SS. When I told him I got mine done for $ 125 from an outside agent ,he looked at me in disbelief. He still gets it done by the sister-who, by the way, is an eldubs wife in a neighboring congregation.
2. Relatives and loved ones shunning them and the sense of shame that shunning generates. Rejection is a terrible psychological wall that few care to climb over.
3. "Lord whom shall we go to .You have the sayings of everlasting life." Most of them believe this is the 'truth', I had one tell me , and I quote," God has always had an organization. Look at David, look at Solomon . They were imperfect. A murderer and an apostate.Yet god continued to use their headship and run his organization through them.The GB isn't made up of perfect men.But god has appointed them. So we just need to wait on J just like the Isrealites did. In the end god rectified things. Show me one organization on earth that has the truth and I will listen to what you have to say." People like him are never gonna break away . They are BELIEVERS and will always try to find fallacious arguments to justify their beliefs. Masochism is a big part of some of their mental makeup. CD is brushed aside with scriptures that inform them so- 'dissenting' with the WORG - is "murmurings" that god asks us to guard against ". And their god knows the WORG has beaten this drum into their thick skulls, and rivited it on with 'threats of HELL and hopes of PARADISE'.