The jokes, etc comments aside, the worst thing we can do to health insurance companies is reform our system so they can't profit off of denying the care our doctors prescribe for us.
They're nothing but middlemen, and this system simply doesn't exist in other developed countries. They all have better care and they pay less than us for it. I realize this might be literally impossible to implement during a Trump/GOP presidency, but we as country can do the best thing for ourselves, while also giving the insurance companies the finger by passing some form of single payer/universal health care.