Honestly, I can't think of any stations that are really in danger of flipping in the market. Now, to play along, and give reasons why the current formats won't be dying too soon:
1. 106.7 If Dave and Chuck come here, they MIGHT tweak somewhat to better fit the younger morning show. But that show could work with the Classic Rock crowd, as well. If they don't get them, then I could see 106.7 flipping. (I think the fact CC hasn't touched it might be a sign about the morning show).

2. 93.1 It's ratings bounce around, granted the range has been lower than in previous years, but considering it appeals to a good demo and likely doesn't cost much to run, I don't see Nash or WJR-FM anytime soon. Maybe a more pop-oriented direction, such as The Lake in Cleveland, rather than the heavy classic rock lean could give it a boost.
3. 98.7 I don't see it going WWJ-FM anytime too soon. CBS seems too committed to it's CHR initiatives. For better or for worse, Amp is here to stay.
4. 89x How much of a difference does a morning show make for one station? Well, here's Exhibit A. Near top 10 6+, top 5 in 18-34 and 25-54 with 'em. 2.0 share and badly damaged demos without 'em. If Cal can't turn things around quick, I could see some personality/music tweaks, but the brand and Alternative format should stay. Plus, if they've been keeping 93.9 around as long as they have, why wouldn't they afford X the same opportunity?
5. 93.9 They haven't flipped it after all these years of ratings in the 1 share range, so I see no reason why they will anytime soon.