There were so many apocalyptic date-setters groups in America in the late nineteen and early twentieth century that eventually one of them would have their predictions "quasi-fulfilled" in some year.
That wouldn't "have" to be the case. Are you not saying that if you keep pulling the handle on the slot machine you'll eventually hit? I've played the slots a lot of times and I can vouch that some of them NEVER pay off. No, they don't "have" to pay off.