Canada? Switzerland? Germany? Yes they pay a lot worse for some jobs (software developer, and, more relevantly, doctor) but ordinary fully-loaded employee costs aren't that different from the US. Admittedly, the countries more comparable to the US tend to be more in the 60-70%-of-US-spending range, than on the lower end.

That does mean that even allowing a generous premium over the most-comparable peers, we should be able to cut total healthcare spending 20% while covering everyone and removing a major drag from our economy, and a major factor reducing overall US QoL. As it is, we're struggling (and largely failing) to even keep cost increases to merely the inflation rate.