Just the sense I've developed after almost 30 years in the military and 20 in aviation. It's by no means some vast conspiracy, it's just that it would be a big cultural shift...that alone has been reason to resist change, let alone actively promote change.

Also from the ,management perspective it would be harder to attract ex-military pilots if they had to start over at regional wages...many would just go get a real job (which most are qualified to do).

All things considered, bringing regional flying in-house would cost more...probably a lot more.