Yeah, the plot really revolves around Charlotte and Emma, first and foremost, at least for me, Lucy ain't far behind, but Suzi is, damn she need development. Kaylah (Charlotte/Emma, perhaps Lucy later), Heather (Suzi), then now Jenny (Emma), yeah that's a couple of secondary characters that, like many stories, are kind of needed, Kaylah is more than the last 2 though, but even then, guess it depends how the producer wants to expand his story, I'm new to this game so I don't know how long the updates takes, don't know how long they are, etc.
If you're worried, then yeah, I suppose it could lenghten the game a lot.