Airlines (aside from WN) still prefer to tolerate the delays and all the added costs that entails to actually moving any significant business to OAK/SJC. Some large percentage of the flying public isn't fully informed on Bay Area geography/airports and/or just wants to fly to an airport with "San Francisco" in its name, so until that changes, or there is some other authority that forces some rebalancing of traffic, this is what we're going to get.