Actually, it IS unconstitutional to require health care at the Federal level...auto insurance is always at the state level, which explains why insurance company A sometimes cannot sell in some states.
One thing that is not being addressed is reality - assuming that some sort of equal and acceptable plan is devised (doubtful), then how does the Federal gobmint ensure that people living in West Texas, rural Arkansas, Appalachia, or any tribal lands, get the exact same level of care, hospitalization, MRI, etc, as the guy living in major metro areas?
Simple answer - you can't: these areas are already suffering from extreme doctor and facility shortages. To mandate and force them pay for something we/they will NEVER see is beyond absurd.
Make it equal access, make it a workable plan, then lets seriously look at it...until then, it is a great thing if one lives in a metropolitan area - live outside the big cities, and you are hung out to dry