Hum I would disagree.

First of all worker coops are pretty much everywhere. I could go to college for free and have healthcare because socialists who organized large scale strikes (they sometime then proceed to get shot by operation gladio). And then, quite a lot of country still pretend to be socialists. Oftentime with very real mutualities who actually helps people.

Humans could never support actual real socialism. We are corrupt dicks and would always figure out a way to exploit it for personal gain. Some form of hybrid system involving some degree of greed(capitalism) will probably always be required.