All very good points, but I must admit that as someone who has worked for years trying to rewrite history, I've become quite skeptical of what does and doesn't reach tale status being proof of anything.
Something you said has my attention, however, and that is the idea of the specific trigger deteriorating over time. That sounds extremely possible and also circles back to the idea of humans arriving from other worlds in the past - who says the cause of our presence didn't exist centuries ago and faded away, only to return a decade ago again when whatever triggered it happened again? A portal that got closed and then reopened, so to speak.
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Something you said has my attention, however, and that is the idea of the specific trigger deteriorating over time. That sounds extremely possible and also circles back to the idea of humans arriving from other worlds in the past - who says the cause of our presence didn't exist centuries ago and faded away, only to return a decade ago again when whatever triggered it happened again? A portal that got closed and then reopened, so to speak.