That quote is perhaps better understood as "something many thought would happen eventually". That doesn't mean they'd know which time in particular well enough

That quote is perhaps better understood as "something many thought would happen eventually". That doesn't mean they'd know which time in particular well enough to cash out. I (and many others) can predict with some certainty that the stock market will have a one-day drop of more than X% eventually. That doesn't mean I know when that will be well enough to "cash out".