Don't forget, some of Earth, Wind and Fire's best songs were basically disco, and as much as I didn't like the genre, I have to say now looking back on it that the Bee Gees were a very good band, very talented musicians.
The first time I ever noticed disco on my car radio (where I mostly listened to pop music) was hearing KC and the Sunshine Band in 1975. Local radio stations (in upstate NY) were playing the song incessantly, and I kept thinking "this can't go on, this has got to be some kind of a fad that won't last." I figured it would last six months or a year, but it in fact lasted four or five years.
There were many A-A bands and musicians who one might say "resisted" disco, doing a minimum of disco songs due to market forces but mostly sticking to their own style and taste. The Commodores were one such; Lady was the only disco-style song I can remember them doing; otherwise, they continued to do great ballads and Lionel Ritchie emerged as the main guy in the band, going on become a solo act. Al Jarreau paid minimal attention to disco, otherwise working hard to keep the jazz aspect of pop music alive, along with Steely Dan and (to some extent) the Doobie Brothers.
Also I thought Donna Summer was a very good singer, although I didn't like her sex-heavy music very much, ditto for Madonna, five or six years later.
I was glad to see disco recede into the background, although its influence has never gone away.
By the way, what ultra-cool band wrote a very popular disco song that contained a prominent cha-cha-cha figure, repeated multiple times, that no one noticed as a throwback to the early 1950s?
I say, “Get the Knack” killed Disco.
I always thought that My Sharona by The Knack killed Disco.