Those of us who have seen this movie a few times have learned to plan for the dips. My rainy-day fund was intended more for FAA medical hiccups than a zombie apocalypse, but it's nice to have none-the-less.

Ideally plan so that you can keep the primary house for a few years with spouse income, unemployment, odd jobs, uber, etc. Minimize debt (mortgage only) and be prepared to liquidate toys or vacation homes if needed before dipping into retirement savings, if you do that you're moving backwards. Try to hold the line, not retreat.