This is the bigger problem. Companies like Google & Salesforce have been there long enough for their early hires to have grown up and gotten ready to lay down

This is the bigger problem. Companies like Google & Salesforce have been there long enough for their early hires to have grown up and gotten ready to lay down roots ... but they can't afford to buy a house and they don't want to raise a family in a small/crappy/inconvenient apartment or condo.