alt Hacker NewsWhen archaeological evidence shows that people largely stopped farming, it usually means that those people largely stopped existing. Or at least living in that area. Apart from a few rare exceptions, agriculture is the only viable way to support substantial populations.
Farming came first, and with it came larger communities and higher population density. That led to surplus, which enabled elites and other forms of existence beyond basic subsistence. And that lifestyle mostly spread organically. Not because the agricultural elites didn't try to conquer hunter-gatherer societies, but because there were so few hunter-gatherers to conquer. Conquered lands were mostly farmed by descendants of farmers from neighboring regions, because they formed the majority of the population.
> When archaeological evidence shows that people largely stopped farming, it usually means that those people largely stopped existing
No, there are signs of habitation. If you look at the evidence from the alluvial plain around ancient Babylon and similar cities from the early history of cities in the region you see people returning to fishing, hunting, and sort of opportunistic planting on river banks. These cities had a tenuous grasp, and people would often just leave, or the city would collapse and people would stop doing intensive agriculture. People would abandon irrigation channels which they had been forced to dig and simply just go fishing. James C. Scott's Against the Grain covers the archeology nicely.