I know it's kind of tipping the debate on the head to suggest that the counterculture is not the "future left" but the "3rd way right" but there is nothing in the mechanics of mainstream to counterculture that suggest that the challenge to the mainstream have to come from the traditional left.
And like the Hippies of the(mostly post civil rights movement) counterculture the maga trumpets are only tangentially linked to any concrete actionable goals as it's about a return to the past that never was without any real clear idea of what that's supposed to look like only that they personally will be bigshots once it happens.
What is however increasingly clear is that the traditional left have been hunted into extinction by both the radical centrist mainstream and the right-wing counterculture as neither of those movement's have any real appetite for the old optimistic "Liberté, Egalité, Fraternité" values of the enlightenment, but prefers stability through authority as a response to an world they mostly don't understand.