@Will_H_69_9 covered the Russ Martin situation pretty well! Great job by him!
The Eagle would have been well-served by having a plan in place to replace Russ when he inevitably passed because the signs were there for years. I'm not going to regurgitate what Will said further because he said it so well, but I do want to state that I agree with everything Will wrote.
Instead, I will cover the second reason why the Eagle fell from grace: iHeart letting the playlist become so stale. KEGL was
always the last Active Rock station on the Mediabase panel to add anything new, they didn't even hop on surefire perennials like Shinedown or Godsmack immediately, but would often wait well over a month before they added even those artists. And this doesn't cover the golds situation, which in some ways was even worse. When an Active Rocker is playing "Enter Sandman" 4 times a day, the playlist has
serious problems, and this is accounting for Russ Martin and the morning show, neither of which played music, eating up 6-8 hours of the day (depending on the state of Russ' health). Clearly KEGL listeners were willing to put up with a lot, but after Russ died they clearly wanted to look for an alternative, and they didn't necessarily want even more talk radio elements mixed in with the rock music.
When John Allers took over KVIL, it didn't take him very long to decide that the only way to revive KVIL's flagging fortunes was to take direct aim at KEGL and create a playlist that was significantly louder and rockier than the usual Audacy Alt playlist. Lest we forget, while KEGL wasn't exactly lighting the world on fire, KVIL was hovering around a 1 share in the beauty contest ratings when Allers took over! It wasn't even a dramatic change, it was simply adding in loud 90's and 00's rockers KEGL was fond of and throwing in a Active/Alternative crossover current or two, without changing the core alternative tracks and artists that KVIL spun. That's all it took.
The two current songs KVIL is playing the most right now are "Lost" by Linkin Park and "Just Pretend" by Bad Omens, two songs that KEGL probably would have gotten around to playing... two months after everyone else, but I digress. It shows knowledge of how much of their audience are migrated KEGL listeners and they need to please them so what happened to the Eagle doesn't happen to them. KVIL is doing VERY well in the ratings right now subsequently, especially in the key 18-34 demographic. They will be an incredibly tough nut to crack for any new challenger, since KVIL is committed to playing both the Active Rock and Alternative lanes and so far seems to be pleasing both audiences. That also indicates that some of the woes gripping rock and alternative with consensus doesn't seem to affect Dallas as much.
I have this to ask anyone who wants to bring the Eagle back - how? Hope KVIL screws up? While Allers doesn't run the day to day for KVIL anymore, he is still supervising the station as part of his job, and considering KVIL is still doing what has worked, the day-to-day PD knows his duties and audience damn well.
The other factor is that iHeart has committed hard to this sports-talk direction to where sunk cost fallacy probably has kicked in. There are contracts that have to run out for a flip to be remotely cost effective. And even if they did... would iHeart really have the ability to effectively counter-program KVIL considering that The Eagle had absolutely zero answer for KVIL's change in approach? KEGL's rock listener base was clearly much bigger than those who were there exclusively for talk, and KVIL has it lock stock and barrel. How are you going to pry them away?
Like it or not, iHeart is stuck with The Freak for at least the next three years, maybe even five, before they could try to bring The Eagle back. Maybe by then KVIL will have become complacent and more vulnerable.