Even if you can't plan on Love as a cure, there might be other ways to remove the demon before it fuses with their souls in the first feeding. If the White Court is going to endure, they can't risk that.
I doubt there is another way, if there is, it is kept very secret. Maybe at some point young White Court children do have a choice, but Raith pushed his children into it without them knowing they have a choice.. Why? So he can control them, we are talking about his own children here, we don't really know what happens with other White Court vamps.
