They live in 700K houses with 3K a month payments. Mortgages will be suspended: banks don't want foreclosures. Again, the tech bros are in the top 5% by income and assets. If they sink, then 95% will have been underwater already.
Are we talking about the same people and same area? You mentioned the top 30% of tech companies. Those folks aren't living in the far flung suburbs in the East Bay. They are living in SF and on the Peninsula, where median home prices have been well over $1M for a while now[1]. There are certainly some tech people that managed to buy real estate back in 2010-2012 at the bottom of the market, and who have been saving plenty of money for rainy days. Those folks will probably be fine. But there are plenty of others who took on large loans to buy expensive houses with incomes that were heavily based on stock based compensation.