Originally Posted by
Semo
Well, to the significant extent that mainstream rock radio was headed for a collapse in the late 1980s, it brought it on itself. Growing up in Philly, we had WMMR and WYSP, both of which were extremely successful mainstream rock stations (AOR, primarily). Both were instrumental in helping to launch some pretty major regional acts in the second half of the 1970s and the first half of the 1980s (most notably Bruce Springsteen, Billy Joel, Joan Jett, George Thorogood, The Hooters, Poison, and Bon Jovi). Although they each had their own orientation (for examply, WYSP skewed harder), they were both a lot more diverse in the early 1980s. You'd hear The Pretenders, singles-oriented New Wave acts, and the like alongside "core" classic rock acts (old and new releases) and pop hard rock/metal. After 1985, both stations circled the wagons and started focusing really heavily on "core" classic rock acts and pop hard rock/metal to the exclusion of all else.
Around the same time, WYSP and WMMR flat out stopped promoting local and regional acts, putting the focus instead on classic rock cover bands (most notably Crystal Ship). As the classic rock fundamentalist regime settled in, even pop metal/hard rock started to age in place. I mean, sure, I take what your point about having some good times during the 1980s. However, I seem to remember a period when it was all cowboys riding steel horses down the only roads they'd ever known while singing sad, sad songs and learning a little patience on the way. Let's face facts: most of that stuff was about growing old. And when the younger acts on the line-up started singing about slowing down, you'd think mainstream rock radio would have gotten the hint, but it didn't.
Now, I might chalk all of that up to local tastes, but judging from the mainstream rock charts of the time, it seems like it was a nationwide thing. Hell, Billboard even made a new chart for singles- and dance-oriented rock in 1988, the "modern rock" chart, so those damned kids would stop jeopardizing the chart position of acts like the Rolling Stones, Rush, and the Doobie Brothers. By the end of the 1980s, mainstream rock radio had become pretty insular and stale.
I'm going to stop there to keep this from becoming a novel. Personally, I think that a big part of the reason that "grunge" happened at all was that the whole mainstream rock apparatus (of which mainstream rock radio was a part) gave up on the youth market pretty much entirely. From a business perspective, that sort of makes sense. The birth rate bottomed out in 1975 after a period of decline, so every year there were fewer and fewer young people to advertise to. Also, those born in the mid-1940s represented a huge chunk of the adult demographic, and everyone was going after that money. Demographics weren't on our side. There were more older people, and they generally had more money. Still, mainstream rock radio really shot itself in the foot in the long run. There actually was money to be made (and I'll explain that with an example if you'd like), but I think that the whole mainstream rock apparatus got complacent and ultimately shot itself in the foot in the late 1980s (and, again, I'd be happy to explain why I think that).