I'm going to climb out on a limb here, hoping all the way I will be wrong.
KGO is, for all intents and purposes, dead. KCBS still is going through the motions of being a 24-7 breaking news station, though nobody who listens regularly would mistake it for the KCBS of 1989. And KQED, which probably has the largest news staff in SFBA radio, largely disdains "breaking" news in favor of longer-form, more analytical, and somewhat "woke" journalism, often bundled into podcasts.
If another Loma Prieta happened this afternoon -- or even worse, a >7.0 on the Hayward fault or the San Andreas adjacent to SF -- who is going to react if the transmitter or tower is knocked off air? Again, there's no one home at KGO, figuratively or literally. KQED would need to get an engineer down to Mount San Bruno to fix or jury-rig the station back on the air, which may not be easy if 101 or 280 are damaged.
And KCBS, both their AM and FM plants are in Marin, the FM on Mount Beacon, and the AM in Novato. If, God-forbid, some part of the Golden Gate Bridge came down, who's going to be able to even get there? (Unless an engineer actually lived there, or Audacy was fortunate enough to have someone there for maintenance at that exact moment. Remember, Marin escaped the worst in 1989 by virtue of being in Novato, and the FM was almost 20 years in the future. (Back then, 106.9 was still owned by Family Radio.)
In a major quake, should TV and a significant chunk of cellular get knocked off the air, don't count on radio to be the information provider of last resort. Nobody's gonna be home. Even worse, should the internet get disabled by damage to a facility like the PAIX, all the Millennials and Gen Z'ers that think the world exists at their fingertips are gnna be in for a major surprise. The 2016(?) Napa quake, the one that happened at 2:30 AM on a Sunday morning, was a small taste of what could be to come, and nobody got knocked off the air in that one, it just was at an "inconvenient" time.