Non-American here: your healthcare system is so abysmal that you could stop short of implementing Medicare for all and still have a significantly improved system. You should obviously have Medicare for all, but let’s not kid ourselves about how far from that you are.

Lots of countries have great systems that aren't single payer.

Should Europe get rid of their insurers too?

as european i am not entirely convinced that it makes sense to have hundreds of companies providing the same heavily regulated service.

if there were too few of those i would probably also object.

idk about the situation where there are no private companies involved at all and the government takes over healthcare top to bottom because on the one hand i see a massive problem with for profit healtcare as it is and on the other hand i can see how incentives would wither away if there is no drive for efficiency at all.