If normies don't procreate, then the non-normies will – e.g. high TFR ultra-conservative religious minorities such as the Amish, ultra-Orthodox Jews, traditionalist Catholics, quiverfull Evangelicals, Salafists, Velayat-e Faqih Shi'a, etc
You may eventually find that the normies dwindle and begin to die out, while the non-normies grow and spread and spread – those non-normies may eventually become the new normies
You may eventually find that the normies dwindle and begin to die out, while the non-normies grow and spread and spread – those non-normies may eventually become the new normies