That ignores the fact that there are already 6 airports in Southern California and 3 (5 if you include Central Valley airports) in Northern California. Do you really think getting to Disneyland or Pasadena will be faster if you take a train to downtown LA than if you flew to SNA or BUR or ONT?
And that ignores the fact that not all of those airports are going to have the same airline coverage as the major ones (namely: SFO and LAX) - and even if they do, certainly not with a significant selection of flights, and certainly not at readily-affordable rates. To the average traveler, they might as well not exist; even Amtrak or Greyhound are more viable.
Also, again: weather is still a major factor for any airport.
Absolutely false - for NorCal-SoCal trips, all of the aforementioned airports have plentiful flights at similar cost to SFO and LAX. And weather primarily affects SFO - OAK and SJC rarely have the same problems as SFO.
