This came out at an assembly right? I remember a friend telling me about it, and that his COBE brother said to him after the talk, "we were duped."
I think jws want their worldview to be correct so much that they, like the fabricators of that this desperate " let us rescue 1914" ploy, - want to make, will it to come true. The calculation of the long lives involved will take the concept into the failed prophecy centennial though. Die hards indeed.