Sex and the City 2.0 and 2.1

Brooke Shields is filming a new sitcom in NY. It's called Lipstick Jungle and it's by the author of Sex and the City, Candace Bushnell. Also filming a Sex and the City-type show in New York is Lucy Liu, starring in Cashmere Mafia. Why are there so many copycat shows? I doubt either one will be as good as the original....