OTOH since Simon is immortal he's going to outlive any offspring he has, so I'm not sure he'll be very keen on the idea. Esthera's watched her daughters grow old and die before - one of the reasons she's so keen on Simon taking her Shard is that she doesn't want to go through it again with Nalili.
I have to say, that's a very good point, and a good counter to one of the fears I had re: Esthera's personal story and where it's going- see, one thing you get from talking to her (especially where *that* vault dialogue is concerned) is that she's just plain
tired of life, and that by doing all the quests to make her happy, all Simon is doing is confirming that he'd be a better IK than she could ever be. Which would mean that he'd be someone she'd be happy leaving her kingdom, the world, and even her daughter to.
But if Simon gave her a reason to keep going with an immortal Nalili, I think that would certainly help in giving her a reason to go on