Not mentioned is the fact that the world can no longer support a population of hunter-gatherers. We evolved to compete for scarcity. Fertile women were scarce, or good hunting grounds were scarce. If you could not compete for that scarce resource you made do with less (or didn't). Poof. tomorrow, work is no longer necessary. There's still the problem of resources and their allocation. It could be argued that the modern human lifestyle is nothing more than an extremely elaborate exercise in tribal fealty. I think it was Nikolaas Tinbergen who said that the modern human lifestyle is the worst evolutionary adaptation since the peacock feather. Regardless, it's what we've got. Food, water and shelter could be in unlimited abundance tomorrow and we'd still have to compete for it. The history of war is not the history of poverty and deprivation, it's the history of greed.