Ah, but lots of languages invented grammatical genders on their own, or use a special gender-signifying pronouns even if the rest of the language lack genders.

Ah, but lots of languages invented grammatical genders on their own, or use a special gender-signifying pronouns even if the rest of the language lack genders. I should know, my native language lack grammatical genders entirely. Yet we use novel words that specify the sex and gender of people anyway. So the gradual shift can't be stopped, yes, it will move around and around. For that is the beauty of linguistical evolution.