Medicare for all sounds good and makes a good talking point. It won't work for a number of reasons, and anyone who knows anything about how Medicare and insurance works knows that.
However, that's not what you asked. If we do go to Medicare for all there will still be insurance companies.
Medicare does not cover prescription drugs, so people will still have to purchase a drug plan like they do now.
Medicare, on average, covers about 57% of covered health costs so there will still be Medicare Supplements or Medicare Advantage plans like there are now.
Medicare does not cover maternity, so we will either need to include maternity with Medicare, which will jack up the premium you'll have to pay, or there will be insurance to purchase that covers maternity.
Independent Ägent, Certified Senior Advisor®