A JW can remain in the doubting state for their entire life, or they can wake up at some point. It usually takes an emotional event of some sort to push them through the cognitive dissonance and start acting on their concerns.
This is so true. I believe that nearly all JWs would have doubts about some things. The problem is the cognitive dissonance is so strong, and they are stuck in the constant cycle of meetings , study, field service, conventions, assembly's, special talks, CO visits and so on, they can never get off the treadmill.
The have been taught that information critical of Gods Organization is Satanic. JWs will not scrutinize their religion out of fear of death at Armageddon. It is the mind control that keeps millions of good people trapped in this religion.
And the worst part is, it actually all crumbles pretty quickly once you put the religion under scrutiny. The latest Watchtower on the FDS is a prime example. The leaps in logic are ridiculous, yet the R&F will accept it as directly from God.