David Field said a couple years ago that he was looking to cut commercial load at his music stations. Commercials are the #1 reason people tune out of radio, and the #2 reason is chatty morning shows. So cutting commercial clutter and eliminating a morning DJ are things the audience will welcome. Field is committed to this format even if its underperforming nationwide. He has other stations in the cluster that make up for any weaknesses at Alt.
What if the target audience doesn't like the music or Radio? If you're station is almost commercial free and people still won't listen, then you have a content problem.
David Field supports the format because theoretically it should deliver those valuable younger demos. Reality may show different results...