Wendell Potter has a good essay on how highly profitable insurance companies want to drop ACA participation. They miss the good ol' days of being able to cherry-pick their clientele and to hell with the sick folks who really need good insurance. I think that forcing insurance companies to stay in the ACA will have constitutional problems. Eventually, there will have to be a public option. Perhaps the cost of that can be paid in part by taxing insurers who don't offer ACA plans.