Communism gets a bad reputation, but actually the idea behind it is great, it’s jus that people are greedy. I’d suggest that some sort of Scandinavian model with higher taxes is probably the most sustainable, but I am no economist!
On the medical story that you linked, surely the idea of an NHS or something similar is that most people won’t cost the system such massive amounts as these guys did, so shared amongst the whole population it is affordable (if the governement actually funds the system rather than trying to run in into the ground!). Also, to what extent are American medical costs inflated by the drugs and insurance companies? This is a genuine question, maybe they are not, but I am suspicious that they might be! Whether they are or not, what a good advert for why we must fight tooth and nail for our NHS!!