If they bring back Moneypenny shouldn't she actually have you know, an actual purpose?
Should she? I don't know. Does Villiers (Moneypenny in all but name and gender) have one, particularly? Does the Moneypenny of Fleming have much of a purpose? Does Tanner? Again, I don't know, but the answer is probably "no".
Sure, Maxwell's Moneypenny was mostly just "pointless flirting", but even so the Eon films arguably managed to do more with the character than Fleming ever did. I'd like a new Moneypenny to be introduced with the same kind of backstory that Craig's Bond gets in CASINO ROYALE (albeit with much less screentime, obviously), i.e. not actually very much backstory at all (one of the remarkable things about CR is that the film seems much more of an origin story than it actually is), but a definite hint of something, y'know, quite interesting.
Still, I don't necessarily take the view that a future Moneypenny or Q must have a solid, plot-serving purpose or not be used at all. I don't see what's wrong with characters who are less important than other characters, or there just for a bit of comic relief or whatever. Neither is it a crime to have elements that are there purely to please "the fans".... as long as all these "secondary" or fannish things aren't overdone or drag the film down.