The whole purpose behind the many meetings assemblies and repetative talks is to keep you from listening to your own inner sense. The Kingdom Hall is full of people who are, one missed meeting away from realizing there are holes in the premise of the religion they've built thier lives around. It is my firm belief that no matter how much some deny it, most JW's know deep down that there is no "New System" there was nothing special about "1914",there is no literal "FDS" and it's very likely that they will grow old and die one day. Despite this (and most of us were guilty of it ourselves) they are quite prepared to shun anyone who tries to point out the holes in their belief system. The cognative dissonance they suffer from allows them to rationalize that even if it's not true, it's a good way of life. They are taught to believe that thier "doubts" are caused by Satan.
The best thing to do is to fade away and explain nothing to anyone ...no excuses, explainations or justifications. Keep them in the dark and absolutely don't argue or try to persuade anyone...draw no lines in the sand. You can't win....just get yourself out and let the chips fall where they may as far as the JW's are concerned.