Hi Steve2,
Your comment " I think it is equally plausible that growing numbers of inactive witnesses simply "hang around" the organisation in one form or another, unable to leave it, but also unable to re-commit to the door-knocking activity" is quite accurate.
I also think it is more of a drag on the organization having these "hanger ons" around than if they left completely. The R&F is more likely to be negatively affected by their lack of interest and this might carry more weight than direct attacks from outside. The rot usually occurs internally because an outside attack brings any group together, even if for a very short period of time.
Thanks Truthseeker for you fine works. I just love to watch these numbers and the direction they are headed.
For a numbers organization it must be everso humbling. :)
battman