If, for example, you had high density housing along the Caltrain corridor you'd probably find that a lot less people would feel the need to live in SF. What ar

If, for example, you had high density housing along the Caltrain corridor you'd probably find that a lot less people would feel the need to live in SF. What are you talking about? There's plenty of housing by Caltrain. I myself live within bed-shaking distance of Caltrain. A shortage of residences near Caltrain isn't the problem. The problem is ... all these cities SUCK. They are homogeneous culturally barren wastelands. THAT'S why people want to live in SF. But by moving to SF in such large numbers, with tech millions burning a hole in their pockets, they are driving up rents and home prices to such a degree that non-techies cannot afford to live there. As this continues, SF itself will turn into a homogeneous culturally barren wasteland - more like San Jose. And the yuppie bars and overpriced restaurants that remain will be staffed by workers bussed in from somewhere else. The art and music and quirkiness will be long gone.