The growth or the depletion of Jehovah's Witnesses is really not the point.
The point is effectiveness as an organization with a purpose.
They either get their job done or they fail according to their own set standard.
Jehovah's Witnesses don't expect to convert the world. They expect to educate the world about Jehovah's Kingdom and his Christ.
BEFORE: Nobody knows about it.
AFTER: Everybody knows about it.
How would you measure what people "know"?
How well informed is the average citizen in 2010 vs 1879, for example?
Ask casually, "What do Jehovah's Witnesses teach?"
Here is what I think has happened. Jehovah's Witnesses have a "reputation" rather than a message impact.
They are the folks who knock on your door to sell magazines and books. THE CONTENT OF THOSE BOOKS is unknown to the average householder even after 139 years of the "education work."
The average church goer only know that JW's DON'T BELIEVE in certain doctrines. They can't really tell you what they DO BELIEVE.
So, it is not an education work that Jehovah's Witnesses have done about Jehovah's Kingdom.
No.
It is a reputation work which has made the name "Jehovah" synonymous with "false prophecy about Armageddon" and "the don't believe in Christmas, Easter, flag salute, blood transfusions, etc. etc."
This is a NEGATIVE and not a POSITIVE reputation.
Stop and think about that for a minute.
To be a Jehovah's Witness means to be a contrarian, oddball crackpot who DOESN'T BELIEVE in such and such, but, who will try to sell you a book about it---which apparently NOBODY READS!
Is this success for them?
Is this name Jehovah elevated because of their work?
Hardly. The name has been damaged and it is shopworn and old-fashioned. YAHWEH is more correct but they've not even taken the honest step of revising their persona to match. It would be more nearly correct to simply become Yahweh's Witnesses. But, hey--that's no going to happen.
Why? Accuracy and scholarship aren't part of the deal.
They are a BRAND with a product that nobody uses.
The religion is not about being effective at all.
It is about EXISTING as a brand.
Everybody is kept busy doing an ineffective "education work" just to keep those hamsters on the wheel until Armageddon arrives.
Do you understand what I'm saying?
This religion isn't really about what it says it is about. It is a way to keep people busy and controlled and self-deluded, PERIOD.