You can't escape a cage built with fear and guilt.. as for the GB, they walled themselves in.
Doctrine does not matter. The GB could tomorrow say that the Qur'an was inspired and start studying that instead of the bible and it would not change a thing. Suddenly 7.5 million JWs will start defending Muhammed. Doctrine means nothing. A JW will deny that the sky is blue, I have been in enough JW discussions they will even deny what the literature says to defend the WTS.
The only way out is to get them to see the bars that imprison them. Until they can see the bars nothing will help. It doesn't matter if every elder is a child molestor. It doesn't matter if every KH gets hit by lightning and burns down. They're in a prison and they can't escape.