I really can't see why The Bay Area doesn't have a Classic Hits station, Here in Fresno there are 5( not counting the LP KYA tribute station ran by Verne "Chris Edwards" White station),Theres KABX oldies 97.5 which is like the old KFRC, KHIT 107.1 Classic hits which is 60, 70 and some 80s but their main focus is the 70s, and theres KJWL 99.3 which started out as a nostagia station and is now playing more 60s and 70 and some 80s music that is a little softer than KHIT and KABX which plays classic rock like BTO and Kansas and R&B such as Marvin Gaye and Earth ,Wind and Fire, and the 4th is a R&B oldies station MEGA 97.9 that plays R&B from the 50s to the 80s. KJWL 99.3 will still mix in Frank Sinatra, Barry Manilow and Neil Diamond, and theres KOKO 94.3 Killer Oldies the is owned by Art Laboe that is mostly R&B from the 50s and 60s that is fed mostly from LA.
We had JACK-FM 105.9 too, it was changed to KMJ-FM, not because of low rating, they were pretty good, but KMJ wanted to expand on their News-Talk format, which so far has not got the ratings they had with JACK-FM.