I remember thinking that finally (and thankfully), grunge was taking over hair bands and that the days of the hair bands were dead. I don't consider hair bands to be 'metal', they were more 'hard rock' at best. But with grunge we were getting back to more of what was heard in the 70's and more importantly, it was getting mainstream radio play unlike most 70's hard rock bands.
Heavy metal is pretty much stuck with what it is...a small niche market that never really will die, but will never really sniff mainstream. In the 90's, it probably came close to mainstream with Metallica, Pantera and Megadeth. But that was short lived and Metallica basically became hard rock in order to stay mainstream.
The 80's was filled with New Wavers and R&B as the mainstream until hair bands basically took hard rock from the 60's and 70's, spliced it with David Bowie's glam rock and corporatized the lyrics. In the first half of the 80's there were not many rock bands that were developed and that had any staying power. In the 2nd half the hair bands became popular, but they had the same issue I see with hip hop today...everybody sounds the same. And you can't decipher the talented artists from the no-talent hacks.
The only thing that has amazed me is that millenials have never grown tired of this. People from the hair band generation still like those hair bands when they hear them on the radio, but they did move on from them pretty quickly.YR