Maybe because we (I) want to see more of the characters. Anyway, all it would take is a good story for a 2 1/2 film. If the other old shows can comeback and succeed, I don't see why this can't for a final 2 1/2 film. Samantha won't be here but she's not the show. Carrie is. Like I said, the damage is already done with the second film and this drama.