What makes me go Hmmmmmm is that in that same time frame the Adventist's have grown to over 17 million followers and have also held to the same beliefs. You can never win the numbers game Ethos the JW's are not particually adapt at getting converts. The old knocking on doors doesn't get it done today.
Since I am a non believer debating the right or wrong of 'Generations' and the Trinity is meaningless to me. I left over four decades ago and back then you had to apply other processes to your finding out the truth about the truth. Eric Hoffer who wrote the True Believer was one source that was very helpful. JW's are not mentioned in his book it was about the radical left and right and those who are driven to join and make others join any extremist cause that gives meaning to their existence. Here is one quote to ponder: "An active mass movement rejects the present and centers it's interest on the future. It is from this attitude that it derives it's strength, for it can proceed recklessly with the present- with the health, wealth and lives of it's followers. But it must act as if it has already read the book of the future to the last word. Its doctrine is proclaimed as a key to that book." If there is one thing that we now know it is that the WTBTS has proceeded recklessly with the present. Their continuous interference against a variety of safe and sound medical practices has affected the health of many of it's followers over the course of their exsistence.
By discouraging higher learning that have had a negative affect on the ability of many to provide for their families. By maintaining that they and only they have the truth they have negatively impacted the lives of their followers by discouraging school sports active hobies, travel (non jw related) interaction with their communities even developing relationships with family and friends who are not JW's. It really doesn't matter about their beliefs what mattered to me and many others was how reckless they have been with their followers. When you understand that you will stand at a tipping point.