Props to both of you--I'm REALLY enjoying this discussion.
While I still do stand by my earlier remarks that KIIS's overreaction to KPWR replacing them at #1 in LA in 1987 after barely a year in existence changed the course of the format forever, as it became less mass-appeal and more focused on 12-24 and 18-34 audiences, there's no doubt in my mind that as a mid-fifties baby-boomer today who had ZERO problem listening to KIIS for most of the decade, KIIS's decision to go after those same teens changed the musical direction of Top 40 radio forever, and for the worse from what I remember listening to KHJ, KFWB, KRLA while growing up in LA in the sixties & seventies.
While 1988-1991 were still good years for the CHR/Pop format, even as stations such as KIIS started loading up on hard-core rap stuff to try and get those teens back from KPWR (did B96 do the same to your market's dominant CHR/Pop station during this same late eighties/early nineties timeframe?), CHR/Pop had become a rather poor imitator of the local rhythmic competitors by 1992, and that's been pretty much the same result in most majaor markets since then.
However, I also have to add that Hot AC (or Adult Top 40) stations today are getting SCREWED by research and having very tiny libraries (250-300 songs tops); since CHR/Pop, CHR/Rhythmic and Urban stations (whether in LA Chicago, NYC or anywhere else) are all hotly pursuing 12-17, 12-24 and 18-34 year olds with outright fanaticism, Hot AC SHOULD be as mass-appeal as KIIS was until the very late eighties or 1991 at the latest.
Using LA as an example, CBS's oldies powerhouse KRTH has freshened its library to include more titles from the early eighties, such as 'I Can't Go For That (No Can Do)' from 1982.
Consequently, that SHOULD leave Hot AC stations plenty of room to play 95% of the stuff that KIIS, WNCI (Columbus, Oh.), WZPL (Indianapolis) and other eighties CHR/pop powerhouses with double-digit share numbers galore used to play in the eighties, alongside the cream of the crop CHR/Pop hits of the mid-to-late eighties and early nineties, as well as the current tunes which you see on the Hot AC charts.
Hot AC should be THE mass-appeal format these days, but that's just not the case; there is a TON of music from the eighties and nineties that SHOULD be in the libraries of all Hot AC stations in America, but an overreliance on consultants and research, as well as the much dreaded 'clusterization' disease, has made Hot AC much less listenable than it should be.
If any oldies station such as KRTH can play tons of music from the sixties, seventies and early eighties, there's no reason why a Hot AC station can't play TONS of eighties product which Oldies stations haven't (or can't) touch, and even a late seventies tune which fits the format such as 'Whip It', as well as early eighties hitmakers such as the Police, the Pretenders and TONS of others.
Insofar as 'could a Top 40 station be a mass appeal station today as it was during the 60s/70s/80s?', I'm inclined to think that the suits at CBS and Infinity have decided that 'niche radio' and 'defensive programming' are the way to go, which is why we're stuck with the schlocky sounding radio in Chicago, LA, and just about everywhere else.
Finally, did I misinterpret your post in saying that CC sold WKSC (butt-kicking signal and all!!!) to 'Regent' Broadcasting, which I've never heard of?