This is amusing on a couple of levels. Several years ago Cumulus took Rush and Sean of their premier stations (e.g. KSFO) and shifted their shows to some of their lesser stations. This was done to promote some of the shows Cumulus was syndicating (e.g. Huckabee, IIRC). It didn't work, and Rush & Sean were back on KSFO after about a year. Evidently Cumulus has retained the lesson taught by Rush's and Sean's listeners.
More generally, Libs & Progs have been prophesying Rush's demise since G. H. W. Bush's election in 1988. Rush will go off the air when it stops being fun or when he is no longer physically able.
The only corner of TalkRadio that is in danger of dying is ProgTalk. The only SF Bay Area ProgTalk station, that I'm aware of, is an obscure Pacifica Radio FM station in Berserkeley whose staff is slightly smaller than its listenership and is as known for its petty-loony kingdom-building co-op manglement as for its content. The less crazy, liberal, station, KGO has been reorganized with Cumulus' Inverse Midas Touch (whereby touching gold turns it into @#$%). In two stages Cumulus canned most of its well-known and -established local hos, replaced them with cheaper unknowns, and shifted some of the known hosts to another Cumulus station. Except for one long-timer they kept, KGO listenership is down, and after several years, Cumulus switched that other station to Spanish language news and business talk.