Medical costs are "so high" because the normal phenomenon of supply&demand is not applicable. "We" don't know or care what our healthcare costs are because almost no one actually pays for it. When you drill down even slightly, you see charges that are multiples of what would be reasonable, and the providers usually just take what the insurers, the government, or some other entity pays, and doesn't worry about the unpaid balance. Probably because it is all bullshit anyway.
It may be true that if "we" had gone to a socialized system after WWII like many western democracies did, we would all be better off today, but a transition now is simply out of the question. The levels of fraud, waste, and abuse arising out of the transition would make the third world kleptocracies look like examples of efficient government by comparison.