So, as I have been on a cult comparison kick lately, how did it work for those doomsday cults when the world didn't end, and they picked a new date, did they become more radicalized or less? (I'm not sure myself, I'd assume it would be the people disappointed leave, and the rest get worse).
... prophecies, per se, almost never fail. They are instead component parts of a complex and interwoven belief system which tends to be very resilient to challenge from outsiders. While the rest of us might focus on the accuracy of an isolated claim as a test of a group’s legitimacy, those who are part of that group—and already accept its whole theology—may not be troubled by what seems to them like a minor mismatch. A few people might abandon the group, typically the newest or least-committed adherents, but the vast majority experience little cognitive dissonance and so make only minor adjustments to their beliefs. They carry on, often feeling more spiritually enriched as a result.