Markets aren't unique to capitalism. They have existed since the dawn of civilization.

"not the dominant organizing principle" is very different from "will go away".

I don't really understand how you can make the claim that people in the near future (relative to the time capitalism has been around) people are going to just give up en masse everything they own so some other entity can manage it "for their own good". This is why making claims that capitalism is winding down via terminology such as "late capitalism" is extremely hopeful at best.

How do you define dominant organizing principle? If all profit was taxed >50% would you have won that battle?