It's never one thing that wakes someone up anyway, it's many things big and small over a period of time that accumulate in the back of someones mind until a tipping point is reached. And yes it's often that one thing that is seen, heard or happens on top of the pile of other things that becomes the tipping point.
I see the mindset of "don't bother this will never work " in exJWs to be one of the vestiges of our JW daze when anything that took away from from dub duties that required extended time or effort was ever worth it.
This movie is interesting because more normies than JWs will see it and be educated on how culty JWs are.
The public need to wake up to JWs as well.