I will say that for the overwhelming majority of JWs, only a very negative, disillusioning personal experience in the religion, will get them to seriously question their religion.
Very few will seriously question after hearing TTATT. Most dismiss TTATT as being nothing but "apostate driven" lies.
JWs have been carefully trained to dull their own rational, logical and critical thinking skills in favor of gullible emotional thinking that blindly and naively laps up rose-colored, self-serving, emotive Watchtower propaganda and super cynically and prejudicially dismisses all negative information just because it is negative, without any regard whatsoever as to testing out its truthfulness. In fact, many JWs will outright tell you they do not want to hear it, if they know you're about to share negative information with them. Classic burying the head in the sand!