Thank you Konceptual99 for your appraisal, very well thought out, and I am sure your estimation, and prognosis, is accurate.
I think it is clear that "fudging the numbers" has gone on for a long time, but as decline in real terms is happening in many places, they will have to "fudge" a bit more in the future.
Then the mind-controled JW's will have a feeling that overall, worldwide, everything is fine and dandy, and the fact that they are sitting in a Kingdom Hall with an ageing and dwindling congregation is just a parochial problem.
You certainly can fool some of the people all of the time.
The slow downward spiral will be imperceptible to the R&F JW's, especially as most who saw dramatic growth in their time are now coming to the end of their lives.
I am confident that the "religion" (Scam) will be, if not gone, then hard to find because it will be so small, in fifty years time.