Bald Eagle makes a good point above, which is basically you cannot run an end-times doomsday cult without ratcheting up the pressure to make them think it really is the very, very, very end.
They used "this generation" tied along back to 1914, and added the cherry on top of 1975 to grow their membership from zero to several million. But once the jig was up in 95 they lost all urgency.
They drug that corpse out of the grave and came up with this overlapping bullshit five years ago, and everyone just shrugged their shoulders. Well the smart ones left. Now they are doubling down like idiots spouting this bullshit publicly. I predict we see plenty of new apostates here in the months ahead after watching this airplane crash.