I think this is an eventuality for any show as it progresses, but it's a phenomenon that shows like the Office have managed to stave off for at least 7 or 8 seasons. Seems like it's happening to New Girl in season 2.
When I say it's not a show for people with brains, I mean you can't expect it to stimulate your intellect. Even as entertainment, for me the show is becoming an energysuck and a waste of time. I keep watching to see if it will get better, but I'm disappointed every week. I'm surprised that the showrunner (and purported feminist), Liz Meriwether, has created such vapid female characters. Jess and Cece (the two core female on the show) are in their 30s and have no drive, no direction, no ambition, and no wit. The males fare a little better with Schmidt, but not by much. Above all, none of these characters seem to advance in any way from episode to episode and the storyline is never remarkably original or intriguing. It's like Groundhog Day every week.
I can't help thinking that if weren't for Zooey and her giant eyes and Hannah Simone in general, no one would watch this show. I wonder how far New Girl will go, riding on the American audience's naivete. Probably quite far.