I think he/she means, Those who feel the same way would not contribute to the gene pool and hence eventually only those who want to have kids will remain, He/S

I think he/she means, Those who feel the same way would not contribute to the gene pool and hence eventually only those who want to have kids will remain, He/She of course makes the assumption that there is a Genotype or Phenotype to select for in the first place. ps. edit gender