Well, it seems like their way to end the season (and possibly the show? who knows if this will get picked up for another season) is to get everyone some sort of happy ending (even poor John, who obviously wanted a family, and by the beginning of this season had made peace with the fact he's not getting the girl he'd been pining for), except for Sara, who is left with this "pain that won't go away". Cool.
I realize that she is very happy professionally and is doing amazing things with the detective agency, but pointing out (incessantly) that she's basically Libby Hatch minus the homicidal tendencies and leaving it at that is kind of cruel.