It's amazing how the politicians representing the people of the Bay Area don't possess egalitarian values. There's so much unused and undeveloped land available in the mountains yet the property is crazy expensive.
I think the question of whether a prosperous region can have both urban growth boundaries and affordable housing is an open question. The Bay Area has not set a good example in this manner; we listen to environmentalists when it’s time to put walls around the region but we don’t listen to them when they call for greater infill development (to their credit, the Greenbelt Alliance has a subsidiary called the SF Housing Action Coalition that promotes infill development, but in SF politics they are often written off as developer shills).