With the Carpenter kids getting older I find it hard to believe the they will not be having a larger role in the stories.
I think their role in a given book will largely depend on how involved Michael and Charity remain. Molly's side character arc involves her anxiety over withholding her current state from her family. I expect that to have some impact on Peace Talks, during which I'm fairly certain Molly will return to the forefront, considering it's an Unseelie Accords event. I doubt Jim will have that inevitable interaction happen off-page. Regardless, it would be a good opportunity to start involving the Carpenter kids more and developing characters a bit. We know Daniel the best, but almost nothing about Amanda aside from her relative calm, that she keeps her uniform on after school, and that she prefers "Hobbit" (which, to me, is a red flag, considering the vast number of Hobbit and Lord of the Rings references throughout the series—just like Goodman Grey recognizing the quote in Skin Game was a clue about his allegiance (cuz the bad guys never get Dresden's references).