A point to consider...a first-year pilot at United or Delta would get over $10,000 in "bonus" (profit sharing) which would go up to over $20,000 in the second year, and possibly way beyond that depending on how much you work. IMHO staying in because of the money is not sound logic.
People should want to stay in to serve their country, the quality of flying, and a sense of comaraderie while making a livable wage. The problem is that the USAF is doing everything it can to stomp out the camaraderie, regulate the flying to death (and take punitive action on a whim...a la Q3s for wearing a baseball cap at OTBH), and force people to constantly choose between service and their own family, which isn't fair to the member (179s, 365s, etc).
So that's the issue...you can make more money at the airlines, have a better QOL, and your family with be better off also. That's an easy choice, and it will continue to be until USAF leadership gets their shit together.