I thought they could have gone into more seasons. It would have been interesting to see what the aftermath of the war would be like. And, I think there was a great deal to talk about Ezri Dax and maybe add new characters to give a more updated feel to the show.
Have thought of a story, that one of Kursans lost son or daughter came to the station to talk to Ezri. Not to tell her she or he was the child of Kursan Dax. They get along and the person dies of a natural death that everyone understood was goingto happen. Right after the death, Ezri finds out the person was the child of Kurson.