I would make one correction: most (if not all) of them believed that they would serve at Bethel in "the short time remaining before the end." They did not expect to be lifers, because they believed that the end was so close that they would not see advanced age before it happened.
I bet that when they saw older Bethelites being sent home, they thought "it won't happen to me, the end is too close." But that is what those older Bethelites once thought, too. And back then they figured that Jehovah would take care of those loyal brothers and sisters. I wonder if they are so confident about that now? I assume that is what they are told as they are being dismissed-- that Jehovah will take care of them.