Thank you to all those who took the time to respond. An odd question I know but I thought worth pondering because this is a belief system that people are so hopelessly dependant upon that they are willing to disown family and friends to protect it. Even die for it, or let their loved ones die for it!
I don't think it is my doubts that will wake someone up but their own.
This excersize could help someone begin to see several things (internally, of course they would probably never admit it to your face) such as they themselves are not 100% in.
At the end of the day most if not all JWs are basically suffering from consensus trance not belief.