Looking back through some board history, I don't find a *majority* of posters who say JACK is a failing format. I do find about 4 posters, a couple of which I would define only as "flamers", who attack JACK, and only one of which uses the "failing format" nomenclature. JACK is merely a modern oldies format, and something will replace it over time, just as something has replaced the programs and shows we come to know now as "old time radio." But for today, JACK does well in the money demo and most likely will for sometime to come.
As for the Zone, 12+, 24/7 ratings never tell the story. It doesn't make the top 10 in 12+ trends, but it appears in the top 10 of the money demo. When you isolate the two drive time shows, where the real competition is, the numbers are even bigger. The biggest story here, though, is that the numbers represent sports fans, typically male, and advertisers that want to reach that audience know they can reach a large group of them here. Finally you see the Zone mentioned here a lot, because I, and some others here, have admitted that when we're not listening to other radio stations because of our work, we too are listening to the Zone.