A short, savage life where one could die in miserable pain from predation, benighted by the obscuring clouds of ignorance and superstition, and living at the tender mercies of an indifferent Nature rather than being masters over it?
That's not my vision of modern primitivism, and my main concern with the Singularity is who is going to have the power to hack into the nanobots in my brain and make me do their will.