Fair assessment.
I always felt "Rock" died in the early 90's, peaking from 1972-1980. Then came disco, and a few good years from '80-'87 and then the bottom of "rock" dropped out.
I also thought Manilow "came and he gave without taking...but then he sent us away." ;-)
I just ran into a lady (mid-50s?) at the drug store who told anyone who would listen she was on the way to the airport afterward...to see Barry Manilow. I asked, "Vegas??" Yep.
For me, rock’s peak was when Nixon was Prez. ...from ‘68 to Watergate. It fell off the chart in the early ‘80s sometime.
I hoid Lebron James is a big fan of Manilow. ...which is about the nicest thing I can say about the guy (James).
I personally date the ‘death’ of Rock N’ Roll at 1975 or thereabouts. Everything after that is derivative... copies of copies. Many of the classic rock acts kind of went into hibernation as Disco took hold.