Judging by the massive growing homeless encampments everywhere I don't think it's really theory anymore. Where I live they have started drilling into trees to set anchor points for clotheslines down by the river, and even have setting up semi-permanent shanty structures out of scrap 2x4s and plywood. TB is a common problem. Everyone bathes in the river.

The USA is looking more and more like Brazil or Saudi Arabia every day. Great times for a select few, shantytowns (or concentration camps) for the rest. At some point that breaks down, regardless of how much you spend on police.

The US is in many ways a third world country, but I don’t think many young people actually know or would prefer actual socialism, as experienced by hundreds of millions of Chinese and Eastern Europeans.

Wouldn't it be theoretically for virtually everyone answering the poll no matter what their answer is?

If you mean that there is no pure capitalist society, sure. But I don’t think many people with experience from a socialist country prefer that even to Brazil at least not among millennials.