Imagine if housing was affordable somewhere other than Stockton. Then maybe people would live in SF and the South Bay (aka: "Silicon Valley") rather than huddling together on the BART and Caltrain. If we had housing closer to our work and commercial areas, people could walk more, too. Instead, folks travel for 1-2 hours each way because they can only afford to live far into the East Bay. I don't know for sure if this would work, but it seems logical that people want to live closer to work, if possible.