Re: "What would happen to a jw, if proved gb was not given special authority?"
This is intriguing.
It reminded me of the first book I studied "Let God Be True" (though every man be found a liar Romans 3:4)
I fear however that the question may rest on the choice of looking to men for hope rather than God. That is the prevalent view in the world today and its persistence will certainly cause many to 'miss out'. But not those who are faithful. That should answer the question.