Nope the dumb ones end up dying. Research R and K-type societies, link below. Eventually the dumb over producers, R-type, don't have any food or resources left. Then the population is greatly reduced, they die. Dead people can't contribute to the intelligence of a society. The ones who survive are the smart who invest in a few kids, k-type. They go on and build sustainable k-type societies that last hundreds of years after all the R-type have died or change into a k-type. Inevitably the k-type population does becomes dumb and dependent and turns into an R-type over time and the cycle repeats. However this does mean that genocidal plots are far easier to create when your society is R-type.
Nope the dumb ones end up dying. Research R and K-type societies, link below. Eventually the dumb over producers, R-type, don't have any food or resources left. Then the population is greatly reduced, they die. Dead people can't contribute to the intelligence of a society. The ones who survive are the smart who invest in a few kids, k-type. They go on and build sustainable k-type societies that last hundreds of years after all the R-type have died or change into a k-type. Inevitably the k-type population does becomes dumb and dependent and turns into an R-type over time and the cycle repeats. However this does mean that genocidal plots are far easier to create when your society is R-type.
https://en.m.wikipedia.org/wiki/R/K_selection_theory#r-selection