What you said.
I remember when it was said, on good authority, the world was going to end, oh, about 20 years ago. Or was that 30 years ago? All of these predictions tend to run together after the end of the world has been predicted with such regularity these last few decades.
Centuries, millenia.
For example, do a Google on the Millerites.
Remember the "88 REASONS WHY CHRIST WILL RETURN IN 1988" guy?