Simple Answer
There's a simple answer to the problem that radio has today.
Someone please tell Corporate that successful radio programming incorporates more than just music.
In the past, kids swapped records, made cassettes, burned CDs, and generally shared music the same way that they share MP3s. Radio prospered because it was the source of new music, and because it offered information and entertainment in addition to the music. Jocks were "cool" because they told you about what shows were coming to town, what places were "happening", what events were going on, what different artists were up to, who the new talent was, what was "in", what was "out", and news that might be important to me.
What do we have now? Radio stations "on shuffle", trying to emulate MP3 player - but with a much smaller selection of music. Jocks are canned - both in the "fired" sense, and in the "pre-recorded" sense. News is mostly non-existent, or a rehash of the morning paper with a dash of the latest from the Internet thrown in - and that's on the news/talk stations!
Upper management concluded that people would be thrilled to hear out-of-market voice trackers who spouted generic infotainment that has little local connection. Even people in the market VT shows hours or even days in advance, which hardly helps them to be timely or relatable.
Programmers end up becoming Selector wizards who are asked create clocks, run music tests, manage playlists, oversee promotions, interface with sales, battle over budgets, and schedule programming for multiple stations. Do you see "developing talent" on that list?
When was the last time you heard a "killer segue"? How often to do you hear two songs back-to-back that a musically incompatible? How many times an hour do you hear a canned "John Goodvoice" promo or liner instead of a live jock? How "special" does that promo sound the 37th time that you heard it this week? When a live jock gets to talk, how often is he/she reading a liner, promoing the latest contest, or selling something instead of relating to the audience?
Corporate has "saved" itself into declining audiences, declining revenues, and declining profits. Maybe they'll "save" themselves to the point where they'll get out of the broadcasting business, and go back to going bust with dot-coms and mega-mergers. Then, maybe radio can reinvent itself again, and become something that listeners can relate to again.