Of course, I lose around 8 - 10% of the home selling price to selling expenses, and pay 20% capital gains taxes on the profit, so that 50% gain is not as large as it sounds.
And sure, I could quit my job, sell the house, do a 1031 exchange and buy in a cheaper area to reduce the tax burden, but purposely quitting my well paying job and moving to somewhere that jobs are less plentiful sounds like a bad idea if I'm worried that we're facing a recession. Not to mention how disruptive it is to my family: "Hey honey, we're both going to quit our jobs and move the kids to a new school because the bubble might be bursting".
Recommending that people homes now and move out just sounds like trying to time the market, and may not leave them any better off. Silicon Valley still still have a lot of jobs even after an economic downturn, some small town here homes are cheap may not.