Unless there's a sustained period of economic prosperity similar to what followed WWII, socialism will continue to gain support among Millennials. Most of the warnings around socialism sound similar to those we've heard about illegal drugs: "I smoked one weed and it ruined my life" = "I put in modest regulation and now it's the Soviet Union"

Edit: Specifically, unless Millennials experience some measure of sustained economic growth and stability, derived from capitalism, socialism will likely continue to rise in popularity.

Capitalism is in need of a better argument than "If you think free markets are bad, wait till you see communism!"