Apopulation has a small size, high level of genetic drift, and very little migration into the population. what will most likely happen to the genetic diversity in the population over time?

The population would most likely start inbreeding and suffer from contagious diseases that would whipe out the whole herd, pack, or flock.

If your on plato: Genetic diversity will decrease because existing alleles will be lost and few new alleles will be introduced.

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.