Over the time I've lived here, we've had the opposite problem: lots of highly paid tech firms moving into SF. This has changed the nature of San Francisco in a way that many dislike,
Increase supply and prices will eventually fall. This is not a complicated problem and the relationship between supply, demand, and price has been known since the time of Adam Smith. https://news.ycombinator.com/item?id=16704501
San Francisco's huge, number one problem has been and still is that it makes building new housing illegal: https://techcrunch.com/2014/04/14/sf-housing/.
Increase supply and prices will eventually fall. This is not a complicated problem and the relationship between supply, demand, and price has been known since the time of Adam Smith. https://news.ycombinator.com/item?id=16704501