Maybe....
But I see this happening more likely.
MM will be one last ride with Murphy, so he can properly say goodbye. Complete with lines like "get on the bike, bitch."
But after that, we may have more Harry/Molly team ups. Mab said herself that the Knight and Lady will be working closely together back in CD, and yet we haven't seen that yet. And it's not like Harry's dealing in mortal deals anymore.
I think Molly is a bit too big to be Harry's sidekick that he explains things to. She knows more about things than he does now. Even if she doesn't know she does, ya know?
As for mortal deals and whatnot, I think we might see him dealing with mortals a lot, now that the mortals are going to be involved in the supernatural world to some degree or another.
We might see a Librarian assigned to Harry from the National Archives. Presumably a wholesome, well-rounded young woman with horn-rimmed glasses and big doe eyes and long blinking eyelashes that will make him think of Sheila. And together they'll research something to stop the book 20 or 21 big bad.
Or maybe we'll meet a grizzled military special forces agent who's assigned to tail Harry on behalf of the mortal authorities, who's skepticism will remind Harry of Murphy and who's suspicion will remind Harry of Morgan, who will ultimately prove himself to be a competent liaison between the BFS and the military. And together they'll deal with demigods-turned-wrestlers.
Lara is actually one of my favorite monsters too and one I like to see Harry frenemies with.
For her to ask permission to court him (not marry specifically, that was Mab) is interesting to me. Lara does things for the White Court and for her power base and this would be that kind of arrangement for sure.
But we still don't see the whole picture here.
and I still ultimately hope to see Harry/Molly - I get that he knew her as a kid and right now that's gross, but time passes and they are long-lived as wizards...time changes things, not to mention battling unspeakable things side by side together.
One thing I came away from PT thinking was that Butcher had changed his tune on Lara. He seemed to be going out of his way to make her more appealing to Harry, as well as make her his equal in some respects. I was baffled at how weak she was at the end of PT, and now I'm baffled that she was that strong at the start of BG after being that weak at the end of PT. I mean, I think her power levels in BG were appropriate, but still...
Anyway, she seems to be genuinely Interested in Harry. I wouldn't call it True Love or anything like that, but I think she respects him and his power and she likes the way he looks. But I'm not sure Lara even asked Mab to date Harry. She might not have been thinking of Harry at all. Mab said Lara "desired a binding alliance with Winter." Lara is modern-thinking enough to not necessarily think that a marriage is the way to accomplish that. And it wouldn't surprise me if we end up seeing her express that in a later book, where she admits that she's not opposed to the idea out of hand, but that it wasn't her intention. It'd go a long ways to making Harry more accepting of her role in the arrangement.