https://www.the-independent.com/news/world/americas/us-polit...
I think the reform that would be acceptable to the median voter is a public option for Obamacare. Just let people select Medicare as an option instead of one of the private companies (and even better, let companies provide it as an option for their employees as well).
If set up this way, I dont see why anyone would reject it. At worst, it would be another option amongst many.
The poison pill would be if opt-in medicare was funded from taxes on the general public who were paying concurrently for their private insurance. Medicaid funding would continue to support the poor.
However, this would only be a start. The real problem with US healthcare is a lack of spending controls. European socialized healthcare refuses to purchase treatment if the cost/Quality of life improvement is too low.