I agree with some of that. I've been to Poughkeepsie, and nothing of consequence ever happens there. But the one thing more consolidation can do is avoid format duplication. So often I see people say "Do we really need 4 sports stations in Phoenix?" The answer is no, but that's not how formats are decided. If the market can support four sports stations or three country stations, that's what happens. But when there are fewer companies owning stations, they're not going to compete with themselves. So you get more format choice. It's the only way some of these more fringe formats have a chance.
The real problem in radio today is that music fans want to control the playlist, and there's no way broadcast radio can do that. So adding another station or two per market might add another revenue stream for a while. But it's a declining stream, and it only buys a few more years before the next round of layoffs.
Yet while consolidation reduces format duplication, it also reduces competition. One of the things that made radio entertaining back in the "olden days" was two or three stations in a market going after the same audience with a vengeance. Competition was fierce, and that made the stations better. As a listener (which I've been for half a dozen years now) I'd rather have two stations in a particular format battling it out to win my ears for a quarter hour than one bland station that doesn't have to try because they own everything else.
And yes, there's no way that broadcast radio can let the listeners control the playlist, so the thing that might help them compete with Spotify or other streaming services is to provide compelling content when the music isn't playing. I'm reminded of an old PD who used to say "hey, anyone can play a Garth Brooks record...what are you gonna do to keep them when the song's over?"