I trend towards 3 to 5 years over a decade in my thinking, but if investors never seriously think that risks or slow or down markets like mentioned are possible

I trend towards 3 to 5 years over a decade in my thinking, but if investors never seriously think that risks or slow or down markets like mentioned are possible the market is absolutely going to be completely misvalued until the mechanisms that prop it up get overextended or weighed down to the point of failure.