The implied growth rates in many tech stocks is unrealistically high.
The Bay Area's long-term employment prospects simply cannot support current home values or rental rates.
Once public and private equity valuations drop a lot of software development projects are going to get cut and with them the jobs of many software engineers. Engineers who keep their jobs probably won't experience pay cuts, but new hires are going to be expected to take much lower pay packages.
Why? Because the talent is going to be available at lower pay rates. So why pay more?
This is not necessarily a bad thing. There's a lot of irrationality in the tech business now and it's crowding out the rational participants. There needs to be a weeding out process. It is good that it has begun.
Remember to think long-term. Technology and the Bay Area are here to stay. Let's get the creative destruction process over with as quickly and painlessly as possible so that we can get on with making real innovations.