NBC has announced that despite the ratings, the show will indeed return. NBC is happy with the name recognition the show has around the world. They had considered announcing an end date as was done with such shows as "Lost," "The Shield" and "BSG." They figure that if they do this, next season wouldn't necessarily be their final one.
While this is good news, the show is not in the clear just yet. Should the ratings drastically drop, this could change. Hopefully the show will turn things around and maintain a steady viewership and possibly gain more in order to keep the show alive. You can read more about it here.