When they finally drive the regionals out of business, and the domestic feed collapses, you will see them contracting out to startup turboprop and small jet operators to recover the feed. Like they did in the early 90s after the collapse of the 80s model of DC-9s doing <500 mile flights. What's old is new again.
They won't be able to do this, because those startup operators will need to hire ATP pilots...unless they want to start the FOs at $40K/year and the capts at $85 plus, and those numbers are probably low. If they pay that much, then the feed will cost too much for a startup...and they won't be getting any cheap pilots from China, either!!!