Agriculture not only failed to supplant tribalism, it extended tribalism through periods of technological development. As agricultural and civil practices advanced, continuously larger populations could be supported and larger armies with more sophisticated weapons deployed.
From the Renaissance through the mid-twentieth century, Europe led the world to modernity, scientifically and technologically, warring endlessly in ancient and re-invented tribal rivalries. Finally, much of Europe lay in smoldering ruins bearing the moral degradation of the Holocaust: mass theft and murder precisely organized and recorded by collaborating modern states.
The culmination of World War II was the profoundly ironic gift of nuclear weapons, given to us by science. With the reality of mutually assured destruction (MAD) becoming the ongoing policy of the nuclear-armed nations, modernity would have to adapt to a balance of terror if the human experiment were to survive.
As nation-states recognize the potential suicide of all-out war, the danger is that extant tribalism can continue to trigger genocide and continue the attempt to draw modernist nations into apocalyptic confrontation.