It's such a core doctrine though, it's difficult to see the reward for the risk of shaking the faith of the older JW's who have had 1914 and 607 carved into their minds for so long. Then again, my mother in law once told me (verbatim):
"If the Organization one day told us not to wear the color blue anymore, we just wouldn't wear it anymore. We wouldn't ask why or question, because when the Organization speaks, it's Jehovah speaking to us."
God I wish I was making that up. We'll see where the insanity takes them. Perhaps they'll just lose the 607 and keep 1914 as a somewhat ambiguous date when Jesus invisibly came to power, sort of like:
"....Because why again? What led us to that conclusion?"
"....Uh.....Um........(shit)......Look out! Armageddon's right behind you!"
(Changes subject)