The first post makes great chit chat over wings and beer or in a hallway gossip session, and in a perfect world it would work. However, we're not in a perfect world and such things would be a complete disaster. first of all, it would cause such confusion in the market that the whole cluster would suffer. put yourself in the listener's place for a minute. "Where did Kat go? that was my favorite station!" and "Wow, looks like The Eagle changed their format!" or "What the heck happened to The Tiger?! This sucks". You're messing with their presets, you're messing with memorized frequencies during their drive to work/home. If you haven't had to deal with confused (and upset and angry) listeners because of such dumb "changes", believe me it ain't pretty or fun for anyone.
It isn't your money, and John Z is way too intelligent to execute such idiotic moves just to be characterized as "smart". He knows what he's doing, and if it was such a great idea, he'd done it already! So shut your mouth, go back and finish your voice track session, and let the pros and owners handle where to put their formats and how to spend their money. If you actually worked as hard to polish your skills instead of playing "monday morning radio station owner" you might actually amount to something in this industry.
To the second post, you said it correctly -- those markets have AMs in the top demos. But you make a false assumption that what works in Houston, Dallas, NYC, LA, and Chicago radio will work anywhere. WRONG! Those big cities have completely demographics than small markets -- different education levels, different incomes, different priorities, different opportunities, different job skills, pretty much different day to day lives all together. Talk radio thrives in upper scale markets -- and by default those upper scale markets tend to be larger markets. Doubtful AM, i.e. news talk, will do much better than they do now in small markets.