Orlando and New Jersey, which are somewhat the model for a modernized talk format, are also Sabo creations. I was across the street from KLSX, also doing talk, at the time so I paid a lot of attention to the format. The recognition that younger FM demos did not want all Bosnia all the Time simply failed to recognize that the younger FM demos, for the most part, did not want talk at all.
They were FM. In central NJ, there was no AM that really covered anything to speak of, so it had to be FM. In Orlando, there was really only one AM with close to full metro coverage, and it was already a traditional talker. In both cases, the stations got on the air on FM decades ago when they could pick up folks at the fringe of the demographic barrier below which there is really no interest in talk and convert... and keep them. But both of those stations are aging just like the rest; WKXW has the vast bulk of its audience over 50. WTKS does better under 50, but not as well as a decade or so ago.
The problem is that those under 40 have no interest in any kind of long form talk, and that non-talk group is expanding each year as the population that grew up on the Internet and with new media ages.
Or, simply proof that there is no news/talk format for "younger people". The mistake was to consider Stern a talk show and to try to build a format out of what was a narrowly niched morning show.
Even if you find the hosts for this, you are left with trying to talk about "newsy" subjects to a demo that does not want that sort of content. There are many reasons, ranging from the attention span of young adults to the way news is consumed today to the lack of life experience by younger persons, but you can put on younger, hipper people but they won't get much of an audience.
LA, Portland, Seattle, Miami, LA... all had good to great signals and did as poorly as the lesser signals and the odd smaller market stations like WKIZ that joined the network.
At the time, AM was cuming in the millions every week in the top 10 markets, and was getting cume ratings as high as 35 or 40 in most of the rest of the top 100 markets. But nobody stopped when they pressed scan and heard an Air America station... they just tuned by or tuned out. It did not stick.
You can't blame the good signal stations for keeping their format. It was winning at the time. So Air America went to mostly second tier signals. But if any of the good signal stations had been a great success, we would have seen major changes in other markets. We didn't. (Yes, AA was badly run but it was on long enough to know that its particular flavor was even less appealing than conservative talk)
To the contrary, it showed that it was too late to use AM for any kind of younger talk except sports. It showed that a different focus did not work. And the fact that "real radio" and its later CBS variants could not pull 25-34's or even 25-44's into any kind of talk in great numbers.