Then there is the inevitable failure point when anything is centralized at that big of a scale. Quality of care goes down, corruption and unaccountability come in, etc. If "failure" is measured by reduction in standard of care, all efforts using government coercion and centralization will result in failure.
The simple statistic is that the cost of health care has gone north of 1/6th of GDP. Not only is that not sustainable, but further growth is impossible. It can only come at the cost of other sectors of the economy, like housing or public infrastructure or transportation or food or the IT we are now using to bring down GOPe.