when folks talk about quality of care, they usually mean wait times are worse in the rest of the world. (every other developed country covers everyone at half the cost that we do) the thing is, we know this isn't true just by lookin at the supply of doctors. we have a doctor shortage.... which means we suffer when it comes to wait times compared to other countries. doctors like to specialize to make more money... so we do slightly better with specialized care. if you dont believe this basic supply and demand statistic, just look at the study done by 'the commonwealth', a healthcare think tank, that measured wait times, and concluded exactly what i just said.
we have ten percent of people uninsured. we know that they still receive care, just not as much. so adding ten percent more people to coverage isn't going to change much, even if they weren't already using care.
no matter how you look at it, this universal healthcare equals wait times thing, is a myth.