Filling the void as you say wouldn’t be that difficult. A void would only be created if a company like Skywest suspended service for United overnight, not if it happens over a couple of years. Comair wasn’t shut down overnight. They were phased out. Flying could easily be phased out at one and built up at another. Same is true for the legacies. United could spool down and the others would simply spool up and pick up the pieces. Bigger airlines than any regional today have gone by way of the dodo. The decision won’t be due to any vendetta, but for business reasons. If they determine that a company like Skywest is the better option, they will go that way. If they think that investing in carriers that they have an ownership stake in would result in more control and a better plan, they’ll go that way and flying will shift away from Skywest to where they want it.