It's where we are headed.
Everyone kicks in for national health care -- like the military.
Wealthier folks can still have private supplemental plans -- which will be relatively cheaper than now -- as the privately insured pool will be a healthier one.
Link: https://www.sanders.senate.gov/press-releases/news-sanders-jayapal-dingell-hundreds-of-health-care-workers-introduce-medicare-for-all/