There still is the issue of "true love" to get around. Was what Harry and Murphy had true love? And if is was, is Harry still protected? I also don't think undoing that will be all that simple, though it sounds simple. I don't see it working out between Harry and Lara, yeah, there is attraction and they share a lot of points of view.. However there are some opposing view points between them that I think will just be a bridge too far for both of them. I really think this will be one of those rare times when Mab's chess moves might actually backfire on her because of the push back she will get not just from Harry but Lara as well.
I agree in part.
I don't think, this will backfire at Mab, because she will have planned for all consequences. And no matter what will happen, she will win something of it.
And for the true love part:
I imagine a conversation between Lara and Mab.
Lara: "Your Knight is protected by the true love curse. The marriage cannot be consumated without him losing it. Please order him to do so."
Mab: "I don't care about your minor problem. I have granted your favor. If you are not content, so do something about it yourself. Or are you not as capable as I thought?"
And I think Harry will be highly motivated to find a way to deal with the Hunger demon. If not for himself, so for his child. Maggie will be in grave danger being too close to White Court Vampires in the future. And he has to somehow free Thomas without his Hunger consuming him.
I believe Harry will either invent a spell or an amulet or a potion to make the Hunger sleep. Or an amulet AND a potion. The amulet or spell for protection against the Hunger. For himself and Maggie. And the potion for the Whampire themselve. To make the demon sleep, as Lea did with the Red Court demons in Susan and Martin in Changes. Somehow it must be possible to do so.
This could be useful for the future.
We don't know yet, if Harry will loose the true love protection or not. But we know how it can be done: have sex with someone. And the other method is still just theory: the marriage vows.
But it is a strong theory supported by the short story "Something Borrowed" (correct title?) when Jenny Greenteeth tries to marry Will Borden. So the marriage vows are supposed to be a powerful magical binding.
And I do think, the true love protection is hard to get, but easy to loose.