Morpheus, I think you have different definition of failure and collapse than you are assuming Slimboyfat has. I think that if you asked SBF if there will be people who identify as Jehovah's Witnesses in 50 years time then they would say yes.
It's the monolithic organisation that faces imminent demise and the fact that there'll always be some fanatics who cling to the wreckage and claim that it's still a working ship is irrelevant.
I think there will be many splinters, all proclaiming that only they are the true JW's, in fact I think you can see signs of that now. I have relatives that are against all blood products and I know JW's that would accept fractions. Some accept what they call Micro evolution (don't get me started) and those that reject any form of evolution. They're already not listening to "Mother" and choosing their own beliefs and this will just accelerate when the society, as a corporation, collapses.
(I made a lot of assumptions about other posters in this post. I hope I didn't get it too wrong).