They will be around and maybe even in great numbers since the watchtower will have another spin or explanation on prophecies and continue to trick and deceive its members.
I work for a company where 95% are Mormons and i have to say that they are intelligent, hard working people, much more balanced than the witnesses... this week i found out that all of them, men and women wear special garments, usually a white t-shirt and underwear that go down to their knees, and they only take them off for showering or having sex...reason for doing so, it shows their dedication to their church and provides protection for them and by the way, they are all purchased from the church.
Now how in the world can intelligent people believe that crap, yet they do, they believe in it and no matter how much you reason with them, it is to no avail.
The witness are in the same boat, they will continue to believe the crap from Brooklyn, New York.