What kind of planes are you getting on? On every flight I've ever been on with a first class cabin, it's been a case of turning left for first class and right for business/economy. No-one ever walks past you in first.
The charm of San Francisco doesn't come from the tech workers, the lawyers or the doctors. What makes San Francisco attractive as a city is slowly being killed by those who find it attractive. The city will become just another large soulless American city unless action is taken to make it accessible to all incomes.