First thing f all, infant mortality is calculated differently in the US than in other countries.  The meme that the infant mortality rate is higher in the US is false.
Lower quality care is a fact. In the end there will be fewer healthcare professionals, fewer hospitals, and much longer waits for specialized care.  In Great Britain the 6 month long wait to see a specialist cost someone I know a foot.
Done their countries pay less?  They sure do, because their governments contracted rates based upon what they were willing to pay.  This is specific to pharmaceuticals.  So the US consumer pays higher rates to cover the losses.  If the US goes the way of Canada, pharmaceutical companies will lose R&D dollars.
One need only look at the quality of care given our veterans to see where this will end up.