As a listener, you and I agree musically. But you're looking at this one way, and not with 360° view. As David would say, you and I are outliers. If more people would listen to all Weird Al on Alternative stations, than what you and I define as Alternative, then that's what's going to be played. Machine Gun Kelly was a rapper first, and is now on Alternative radio, much to my dismay. But they are going to play what gets the most listeners. It's up to us to decide if we want to go with the crowd, or break away from the norm.
Take SiriusXM for instance. Octane is on this kick of trying to redefine the narrative of people not liking Nickelback. They also are pushing Avenge Sevenfold. Two bands I don't like. So I change the channel. Octane is having an Avenge Sevenfold takeover, this weekend. So I'm not listening. I'm going to Alt Nation, Bluesville, Turbo, Faction, and even 80s and 90s channels. And if they aren't playing anything I like, I switch over to music saved into my phone. There's always options. But they program for the mass population, and we're just that...outliers.