The strange thing is that all us ex-JWs have vivid memories of it all and yet if you ask current JWs about it they will feign having no recollection whatsoever.
I can recall a discussion about the 1975 thing with my sister and her version of what happened was very different than mine. They say memory is not reliable as it is very selective. I think from my sisters point of view she only remembers the positive things about the religion and chooses subconsciously to forget the negative things. Again when a person has two conflicting belief systems going on, they will choose one or the other. It is a social network for them and to know admit that their train of thought is wrong they would have to deny the last 50 - 60 years of their belief system.
That CO that said the 15 years time line I would say is someone that is now in the 50 to 70 age group and knows his days are numbered. I would say it is his ego and the fear of death that he thinks he is that important that this world cannot exist without him. I think that is the only way he can go on pushing the religion. I did notice with my parents although they would never admit it, we were not supposed to die in this system, the last few years of their life when they knew the reality was that they were going to die, I noticed that it was like their spirit was crushed. I know to their grave they never gave up the hope but it is so sad to think that all your life you chase a dream only to realize in the end it was all a lie.