I mailed to a whole neighborhood where a sister lives. It was a 3 page letter that exposed the Watchtower. It hit hard and killed 2 budding studies on that street.
Interestingly, the sister said "This must be the persecution that we were told would come"
She couldn't see the forest for the trees.
The facts revealed about the ivory Tower made no headway with her. Her brain is burnt.
BUT, it the WTBTS folded up, this would make them start to rethink, although even THAT would take time.
I think that if you set a JW on fire, and the GB said that they were NOT on fire, they would make no effort to stop-drop-and roll. They would just keep going door to door while on fire.
The question then is, if a JW on fire came to your door, would you put them out? Or would you even open the door? After all, a burning ember might ignite a curtain or something.