Affordable Care Act served up millions of Americans (with the help of the IRS) to private health insurance companies. Jimmy Carter's traditional Medicaid certainly did not include third-party profiteering. GWB's Medicare Modernization Act in 2003 also welcomed private insurance companies into the fold with Part C, D, E, and F.

Advantage plans are notorious for denying anything they can get away with and really making the customer jump through hoops. Private Health insurance companies have stock holders to please whereas government-funded Medicare only loyalty lies with the enrollee. It'll be an instant and noticeable decrease in benefits and services, I'm afraid.