I guess that managing a mind-control cult is quite a delicate thing
Cult leaders may get large followings, but it does not follow that they are particularly intelligent or naturally know the best way to lead. It is often a mix of trial and error. Most fail and a few succeed. The WTS can be congratulated for doing better than most, and surviving some dark periods in its history, such as after the failures of 1914 and 1925.
However, as can be seen now, they do not know the best way forward without the great carrot of an end date and are making a number of counter-productive changes.