The amount of money we spend on healthcare in excess of the OECD average is more than we spend on the military. 10% ish of that is the entire yearly profit of the healthcare industry. The other 90% is raw inefficiency. And where does that 90% go? Mostly to salaries. Eliminate our inefficient system, and you eliminate millions of middle class jobs.
No politician will do it. They may talk about it and campaign on it knowing it won't happen. But they will never pull the trigger because it would be political suicide.
Also, if you want to know more than you ever needed to about the US healthcare system and why it is so expensive I highly recommend this report: https://www.mckinsey.com/~/media/mckinsey/industries/healthc...