But the problem is the length (plus the separation, in the case of IFR). There was a grand plan to use landfill to both extend the runways and increase separation. It was shot down by the watermelons (green on the outside, red on the inside). You'll see ... when the time comes for routing, very few if any 380s will actually touch SFO ...
How do you increase separation of runways that already exist? Doesn't that imply tearing out existing portions of runways?
Actually, according to SFO officials, A380 operations will be like that of 747-400 operations--no side-by-side landings and takeoffs. Given the fact that relatively few airlines will fly the A380 to SFO until at least 2010 (only Singapore Airlines and Lufthansa has planned flights to SFO officially for now), the runway spacing issue will not be significant.