France is depopulating badly so that Frenchmen and Frenchwomen are set on an extinction course. It’s not as if special reinterpretation of marriage will magically change that trend.
It is said that Charles De Gaulle once remarked that he pulled France out of Algeria out of concern that his hometown of Colombey-les-Deux-Eglises would be renamed Colombey-les-Deux-Mosquées due to demographic changes resulting from Algeria remaining under French rule. That name change may come anyway.