Hmmm, I have thought about it.

First of all, Eirfeel is not considering the eradication of men. Her goal is to show the world the strength of women.

If men come to recognize and worship women's strength, that's all that matters.

So even if Eirfeel finds a technique to get pregnant by women alone, it would probably only be used within Luciana.

I don't think she would impose her method on the rest of the world.

Only those who wish to live as only women will live in Luciana and leave their descendants as only women.

Millis will most likely eventually leave Luciana, as she adores her brother.

However, a future in which she changes her mind and lives as a soldier in Luciana is also possible, albeit slight.