I agree, please keep micro-politics out of these discussions if possible, as I can very precariously fall into the trap myself...
As far as Moroder is concerned, it is not an accident that he won the Oscar for 'Midnight Express' beating incredible scores like 'Heaven Can Wait', 'Boys From Brazil', and 'Superman'(!!)...
About the 'serious' music thing I believe the other thread is more suited to an analysis, but quickly here, I believe that whole populations of mal-aspirers were encouraged to continue writing hilarious modern morceaux regardless of the quality, for at least "they were on the right track"; eventually they never wrote a bar worth anybody's hearing, but they did get degrees officially branding them 'Composers'. Anybody that wrote anything harmonic would get a professorial response like "if I wanted to listen to Haydn I'd listen to the real thing and not a poor imitation"... Nobody writing a sorry imitation of Webern or Boulez got the same; the least the procensors - oh, I meant professors - could have done, is apply the same standards for everyone. Instead, standards kept falling and falling until these post-thinking, post-mortem, errr - I mean post-modern days, everything is a soup. Now, finally you can write minuets at university, as much as you can write palindromic, pseudo game-theory based, half-integral serial spectral pieces and get through. In these politically quorrect, ahhh I mean correct (what's wrong with me today...), brotherly and sisterly times we live, there can be no disrespect, no dismissal of anybody's ideas or artistic expression... After all, who's to say what's right anymore? What would he know?...
Timeline? I'd say this goes back to the late '60s in the US, for Europe I'd say it took two or three more decades for us to catch up.