Yes, I think that's very close to the truth. I have often observed that highly religious people (and I don't mean those who just go to church every Sunday) are very anxious. They seem to suffer from an existential fear of death and the unknown. They are unable to simply shrug off the big questions and attend to the minutia of life.
This is something I can personally identify with. It drove me to study philosophy, science, and paranormal phenomena. But perhaps JWs and other highly religious types simply don't have a lot of confidence in their own ability to sort through these issues, so they turn to a higher authority for answers.
Also, I think you have to possess some mental stability if you want reach answers to these questions, since there is no guarantee they will be the answers you would find comforting. The whole idea of universal heat death disturbed me profoundly to such a degree that I read several books on cosmology in an attempt to refute the possibility. As long as the jury is still out on the large scale curvature of space-time, I'm putting my hopes on a big crunch/big bang oscillating universe