United will probably be a long-term survivor, although a trip through bankruptcy almost certainly be required. United's route system is very strong, centered around well-developed hubs at important airports. UA will probably have to "de-peak" ORD and DEN the way AA is doing with ORD and DFW, in order to more efficiently make use of employees and have less down-time. But the hubs themselves will remain, in smaller size.
The silver lining is that de-peaking by both of ORD's major hub carriers should help congestion there, and UA/ AA pax will face fewer delays. The Northwest-suburban NIMBYs have the upper hand in court right now, and the Daley-Ryan reconfiguration plan is in real danger.
I don't know about anyone else, but I'm not inclined to "pee on the grave" of any airline. Yes, we'll lose at least one Cartel-network carrier--US for sure, and an outside (very small) chance we may lose UA. Disruption is always painful to those involved, even if it is economically necessary for the health of the industry.
Need a new airline paint scheme? Better call Saul! (Bass that is)