Corboy,
I think you nailed all the biggies in your list "losses" for deconversion. Even a couple of those, operating intensely, would prevent most people from making sudden change. A lot rides, too, on the personality of the subject. Some people are just more prone to attachment, group involvement, loyalty, etc.
The potential detractor for us to consider, here, is what I'
Forum:
"Cults," Sects, and "New Religious Movements"