Zenith can absolutely be healed, would be stupid if not. More importantly, though, this gives both Norn and Aisha a perfect meaning for their life: Aisha no longer is just a maid for fun, she's now caretaking of Zenith. And Norn will have the drive to study healing magic to restore her mother's health. And Sylphie gets to train for with the "big baby" for when hers is born >_>

But yeah, seeing Rudy and Norn meet will be tought. "Dad died when he saved me" might not be to Norn's liking. "SO HE'D BE ALIVE IF NOT FOR YOU!!!1"