I will admit Karen didn't have a strong storyline this year. But she was the only one trying to Bridge the gap between the cliques.
Karen adds too much to the canvas to leave at this time. She is the comic relief, she is the advice giver, she has the most stable marriage, and she brings a level of substance with spotlighting women's issues.
These shows shouldn't just be pure mess. The fights and feuds are more intriguing when they come from a place of truth.