Do Comair, ASA or Eagle have the planes and crews to replace SKYW's routes tomorrow? The passengers SKYW carries today need to be carried tomorrow and next week. They won't postpone all their plans until the airlines can work out a solution.
The most likely scenario is that UAL and SKYW continue to operate even through a financial BK for UAL, and whoever replaces UAL in major western routes turns to the ready-made solution in SKYW to handle the feeder traffic. Why not, SKYW does it well and does it profitably.
That's why this whole selloff was so overdone, IMHO.