So that particular pressure chasing prices down is significantly less than what you have in say, Temecula.

San Diego county is next to Temecula.
The bay area is next to the central valley.

People in Temecula commute to work in San Diego.
People in the central valley commute to work in the bay area.

Both Temecula & the central valley has a lot of land to build on. The central valley to the bay area is what Temecula is to San Diego.

But there is more: the worst real estate bubble in CA is NOT the Inland Empire (Riverside & San Bernadino counties). It's the central valley. Why ?

Speculators from the bay area flocked to the central valley & drove prices to insane levels. So, on the surface, the devastation may occur in the central valley, much of the the money that's lost is bay area's money.