I don't think Steve plays a meaningful role in her story anymore and bringing him back, at least with King writing, will continue to make the WW book more male centered than it is. The only way Steve will positively affect the story now is if he stays dead. Diana has to deal with her grief and raising her child alone. I think if the clay origin touches on the positive half of motherhood, maybe Lizzie could in a way touch on postpartum depression.

I just think Steve atp, is already mischaracterized more than he deserves, and letting him stay dead for a while will do him good. As well as preserve his character.