My parents and I were always taught that somehow the King of the North would finally be revealed, and that also the preaching work would be fullfilled, and that we'd then have another message to spread - not of warning - but of impending destruction by Jehovah our God!! Everyone kind of looked forward to spreading this one-last message, sort of an in-your-face "We told you so!" type message. I have not heard anything about this end-time type of message in years, probably since the late 80's, early 90's.
I remember this loud and clear and kept thinking about it as I posted in the "time left is reduced" thread. I think its another paradox for the WT. They have to declare the preaching work over, or at least the ingathering portion of it to begin this "warning" message. That begins a countdown to the "great tribulation" they cannot bear to mess up. Since they are SO good at screwing up dates, chronology, and countdowns they are kind of stuck. We will be watching them and will hold their feet to the fire. So their warning message may never materialize. Another example of JWs being duped and totally assinine theology IMHO.
Isaac