Evolution will work its magic here. Only the ones that have children stay in the game. The single mom path is a destructive one but the married path works out better. Evolution will weed out the losers like it always has .
Not in the way you might think.
Evolution might favor more low IQ, feral children from single moms, because the current environment encourages their reproduction. Whereas evolution might disfavor children from high IQ stable homes.
Evolution does not always favor the smartest, strongest, or prettiest. Only those best able to adapt to the current environment.