The point is that the people you mentioned indeed did dedicate much of their life to radio...but every one you mentioned also had a pretty good life outside of radio while they were in it and outside of it.
Each of them CHOSE to be in the business as long as they were.
Pertaining to management or ownership, well, if you own the place, it's your call. If you don't, it isn't. It's the same in any business. If you choose to work for this person or that, great - if not, you always have the option of making a change.
I've done this on several occasions in my career. I've stayed when other opportunities presented themselves many times mostly because I liked where I was and what I was doing. (In retrospect that probably kept me from doing bigger things). I have also left situations where I was not comfortable doing what I was asked to do, even very recently.
Anger over the evolution of the business is wasted time. Much like other industries, trust me, it isn't going to change, it isn't ever going to be like it was before. Things have moved forward and as I said before, if you want to remain in the business, you move forward with it, not against it. Equally, one always has the option to make a choice to do something else.
I also offer this advice to anyone who will listen. If you've been in radio for more 4 or 5 years and haven't risen to the position you imagined for yourself, it's likely you won't, for whatever reason. You may not be good enough, you may not be as good as you think you are, or you may just not be what current management is looking for.
With that in mind you have the option of working for less at a smaller venue or lower level position, or get on with your life and do something that supports your lifestyle, whatever that may be. If you can't get over the "radio bug", find a station that needs someone part time on the weekends and do it for fun if you have to, but keep your day job.