Further to your though DOC, "Nobody went broke underestimating the intelligence of the American people," someone said...
The leaders of the Watchtower cult have a lifelong tradition of total prophetic failure but are equipped with with a mind bending propaganda machine to feed the minds of their unquestioning flock. JWs are willing slaves in a cult which gives them nothing in return but a worthless and spurious hope.
The amazing survival of this failed cult is by careful manipulation of the misplaced trust in the hype given out by the governing body that they alone are the channel to God, the one and only divinely inspired religion.
With the unholy internet bringing real enlightenment to the JW wobblers and the more alert public; the numbers of JWs should level off and then decline.
Christianity is a delusion in the first place (no God-man, Jesus or otherwise, is ever going to save even one person from death---and Adamic sin is a myth!) If Christianity is a con and has lasted for over sixteen centuries, what chance is there of an abrupt end to the JW cult which is just one of the forty thousand variations cashing in on "absolute truth"?
However, towers if built on bad foundations, can and do fall suddenly.................