Keep in mind, events can bring more villagers to perpetuate a village, or alter ages; no viable couples NOW doesn't mean there's no hope.
so is it worth it to keep playing the game if your doomed with no women to repopulate?
Why not? VV2 permits you to run two tribes together. Why end a tribe encountering difficulties, when you can just try the smoother path with another tribe while you wait for them to try and overcome it?