California's Wonder Valley is arid and sparsely populated, where property values have jumped close to 20% in the last year, according to an estimate by Zillow. The typical home price is now close to $180,000. That’s a far cry from LA County’s sizzling real estate market, where the median home price is more than $700,000, according to the financial services company CoreLogic. But people who have lived here for decades are wondering what all this change might mean for them.