Agree there are many things that could derail the current real estate party, but, imo, those who have been in the market for many years–and bought primary and/or investment properties when prices were much lower–as most here have–as well as many new buyers–most of whom locked in low rates–might temporarily be affected on paper, if at all, and will simply look at any downturn as another buying opportunity, as gzz said.
Barring extreme catastrophic events, I believe the need and desire for housing will only increase going forward, so I’m sure many of us, if given the opportunity, will take advantage of another downturn, as we have in the past.