This is going to be a long reply, so you've been warned...
My guess is CC has been royally pissed at Main Line since Click signed on, and maybe even as far back as when Fly replaced Z-93. Now, they've hatched a plan to switch Lite and Channel's frequencies. Why? Lite's demos are aging. Channel will bring in the 18-34 youth-oriented crowd. However, if CC thinks that putting an automated CHR on a big stick is going to work, and 99.9 will instantly become Dayton's version of WNCI, they're dead wrong. They have to have live and local personalities on there at some point. WNCI has The Morning Zoo(Syndicated, yes, but broadcast from WNCI headquarters), Chris Davis in the afternoons(Who's been there since the 80s in the glory days when Nationwide owned WNCI, hence the call sign), and MD Sean Cage at nights. The only 6A-Midnight shift without a local jock is middays with Seacrest. PC should be saved ONLY for smaller signals, which is why it worked on 94.5. On 99.9, which has always had at least two local jocks(The last being Paul Ellis and the still-employed Kim Faris), they HAVE to have some presence in the community, or this will fail. Also, this move basically makes Channel THE big brand in the CC building, much like WNCI is in Columbus, while WLZT is the flanker(Even though it's on a 50,000 watt signal), and protects WNCI from WSNY.
IMO, CC may have shot themselves in the foot with this move. This move could take listeners away from Mix, especially on the younger end, and Lord knows Mix doesn't need to lose listeners at this point. I'm sure Mix has lost some listeners to Click at this point, how many is anyone's guess. Say the younger listeners decide to listen to Channel and abandon Mix altogether, then Mix's demos start showing age, since all that would be left is the older demos. Also, how many Lite listeners are upset that their favorite station is now on a weaker signal?
Also, Mix did that notorious 4.7 a couple of books back, and nothing was done to change the station. Why? However, Lite ends up paying the price for their one 4.8, and losing their home of 20+ years? Personally, I think this move was made b/c Main Line ticked them off by putting Fly and Click on the air to mess with their cash-cow, Mix, and take listeners away from their flankers. It must have worked to a degree. Click's ratings are TBD, but had Click not signed on and Kiss Country stayed when the move to 101.5 was made, Lite and Channel would've never changed frequencies, that and CC was probably fired up that ML had the #1 CHR in town(Even though it's Rhythmic CHR).
Now, in the aftermath of this change, where does that take us? Channel is now one of the big brands in that building along with Mix and WTUE. The flankers are now The X, Big, and Lite. Will this move be a big blow to Click and Fly? Will this have been a smart move on the behalf of CC? What will Main Line's next big move be to respond to this latest CC move? Hard to tell. The Main Line VS. Clear Channel battle is just warming up. They're both smart to NOT mess with Cox, and instead just mess with each other. Hopefully, in the end, this war between ML and CC will result in better radio since the competition for listeners will be fierce...well, I won't go THAT far, but I can wish, can't I?