I think it depends a lot on the radio stations that happen(ed) to be available in your listening area. When I was living in Tampa ~30 years ago, there were certainly a lot of "hot hits" type stations, but there was a great commercial AOR station I listened to more often -- and a few years later I discovered WMNF, an eclectic non-commercial community station that played virtually anything depending on which show you found.

Now, of course, my "listening area" is the whole internet. KCSN in Los Angeles is a rock-focused public radio station; KCSM up in San Mateo is a terrific Jazz station; Great Big Radio is an internet-only station that's technically oldies, but covers everything from the 1960s through the 2000s and likes to get into deep cuts. I do subscribe to a streaming music service and use it pretty frequently, but I suspect I find just as much new music through internet radio as I do through "discovery." (Although both curated playlists and algorithmic recommendations surface stuff I find interesting occasionally.)

Successful for whom though? Listeners who want new music? Definitely not, but most don't.

One of my friends only listens to pop, and most people are like him in that he doesn't go out of his way to listen or watch anything new.