Today? If I'm Bronner, I liquidate now and save what I can. It's brutal, and such a prospect would pain me personally as the folks on the frontline at US have been very, very good to me. However, I'm convinced that the window of opprotunity to make sweeping changes closed about 1 year ago.
US, had it played the Chapter 11 game correctly, might be salvaged as a going concern. I've feared for some time (notably since it was clear that Siegel was not actually doing anything to change anything except for labor costs) that the relative inaction during and immediately after Chapter 11 would result in the death of US.
Today, there is just not enough time (or cash) left to do what would have to happen to save the airline, even with massive concessions from labor.