I hope that one day they are gone and receive only the barest mention by any media source, although you really don't hear that much about them. I know that since I have faded (still fading actually) that I rarely hear any news about them and only from my family who are still very much zealots of the religion.
I think that, psychologically, it is a good thing that they fade instead of an abrupt ending. Could you just imagine the chaos among its members that would ensue? They would think that A) Armageddon was here and who knows what the truly indoctrinated would do then or B) it is just some big test from Jehovah (though they say that God doesn't test anyone in modern times). It would be too much of a shock to the system and I would not want the cold water of truth that was thrown on me to be thrown at my family.
No, a slow fade, and eventual extinction, is probably for the best.