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Different factors:
1.) What once symbolized teenage revolts later became mainstream. Those who listened to "Rock Around the Clock" with Bill Haley in 1954 eventually grew up, married, got children and bought a single-family house or apartment.
Rock musicians would continue trying to shock, and destroy hotel rooms. But at the end, no hotels wanted them. Hotel reparation costs were expensive....
Soft rock later came, but never shocked anyone and was never intended to do so.
Punk rock would later shock for a while, but on the other hand a lot of people also agreed when they took up social problems in their songs.
When rock musicians and producers couldn't shock with "Rock Around the Clock" anymore, they had to go with something else, like hard rock and heavy metal with Satan. But after a while it got tiresome, and time went on.
2.) The major arrival of music videos in the mid-late 1970's, and MTV launching in August 1981, slowly made appearance more important, providing more space for other types of pop music than rock. Today, music videos are still around, but usually online.
2.) When the Internet broke through, the music industry suffered major economic losses. As we all know, most downloadings between 1995 and 2010 were illegal.
3.) A lot of things (music, movies) who were once surrounded by excitement for young people, are now just a clic away and less exciting.
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