Help with defining some of the terminology in this discussion, and in the university report.
When people discuss this topic regarding CURRENT music I see the argument one way.
But in this discussion, it becomes obvious if you are applying the research to older music, to favorites, etc, then "hits" gets a bit different.
Now, I could well be the oldest participant in this thread. There are days when I would like to turn to a station for awhile that would bring me some "Big Band Sounds". (There is NOT a large demand for that genre from the radio audience today!) But if you are running a Sunday night nostalgia show and feeding my hunger, you are probably wise to stick with the songs that WERE hits in their day. Maybe the show host remembers being in Europe during WWII and has a favorite Glen Miller recording that most people have never heard. May be a great song, but if the geezers haven't heard it, they are likely to say: Forget that... give me "In the Mood".
Does that scenario match up with the way you read the academic report?
If you are in a programming situation where you would be playing songs from the 80s, play only what was truly a hit in the 80s... not the fringe stuff?