Funny you should mention this. In my recent conversation with my mother she did a complete U-turn and admitted that what was taught at times was wrong. She didn't even deny the 1975 blunder when i brought it up this time. Obviously this was put down to 'New Light'.
This subject always makes me a little irrate so i said to her that:
'Right you believe the GB are not infalliable! She agreed. Yet again and again they have openly referred to themselves as 'God's mouthpiece'. If this is the case then they should'nt be getting things wrong because it's as if Jehovah himself has spoken.' Apparently if we were revealed everything in one go we couldn't handle it, that was her honest reply. At this point I and my wife just chuckled at how ridiculous it all is and ended that discussion by saying there was no point in discussing my views on this if she is not able to see it from my point of view, as it would simply end in a circular discussion.
Even if we can get highly indoctrinated ones to see that the JW religion has made mistakes, which a most won't (at least not openly) they will always have an excuse to reason away any doubt. I believe an individual has to be at a certain point in life or come accross a massive spiritual hurdle in order to effectively see TTATT. Lucky for me i was already somewhat 'weak' as a JW for various reasons but still this is all i've ever known in 28 years, so to go from that to seeing it's all utter BS in under 3 months is incredible.
But more to your point Yadda, i do feel that the leaders of this cult need to be the ones to admit to their mistakes, as it's their decisions and teachings that affect millions of lives across the globe.