>but people with good insurance in the US (read - middle class job) have access to better healthcare in the US.
Careful. If you read the article, the threshold for middle income in the US in 2014 for a couple is under $35K/yr (household). I doubt most people with that salary get a pretty good insurance policy through work. To give you an idea of what that can cost, see my comment here:
Point being, if the US moves to a single payer system in an effort to lower healthcare costs, a lot of people in the US are going to have to readjust their expectations.