SLC stays if Doug wants to take pressure off PHX. Not familiar with SKYW contract, but lawyers will find a way to break it if SLC is not a part of the plan. Republic is probably a very big winner here.
Skywest's future does not necessarily depend on SLC. The deal with Delta made pre-bankruptcy included a clause that said if the contract is broken before the ammendable date (10-years I think) then Delta pays Skywest $125 million. To my knowledge, it says nothing about SLC, only gates in ATL. ASA is included in all of that.
Republic, Mesa, and Skywest all have the money to buy their way out of trouble. That leaves Comair. I'd fully expect to see Comair completely replaced in CVG and JFK by Republic and Skywest. Mesa done pi$$ed a bunch of people off, so they just might find themselves outside looking in.
As far as hubs, I think SLC takes the biggest hit, although Delta will still remain the biggest player in town, at least until Southwest gets enough planes. CVG has far too high a yield to let it go the way of PIT, and PHL is too far away and too messed up to affect CVG. Not to mention the loss of CVG would rid them of their furthest northwest operating hub besides SLC. You'd have nothing between PHL and SLC, which is a very significant market area, especially considering how people in that area are sick to death of ORD. ATL is obviously fine, but I'm not sold on CLT making it unscathed. It'll still be big, but it just doesn't make sense to have ATL and CLT both mega-hubs. Yields are high there, but yields at the hub airport don't affect ticket prices of the connecting pax. I'd expect smaller aircraft out of CLT to retain market share and O&D yield, and remaining connections going through ATL or CVG. LAS and PHX are powerhouses for Airways and connect everywhere West better than SLC except for Seattle/Portland area and SFO to a much lesser extent.
I get the impression you like talking route strategy. Keep it coming! Its nice to be able to toss ideas back and forth with someone who knows a thing or two about it.