^The director at the time wanted to make a statement so it was more of catalyst for change rather than a necessity of the story. Most of this is from memory and I could be wrong but at the time the director lost someone very important to him and thought he could use this game to teach children the importance of coping with that loss, and was tired of how every RPG up to that point never raised its stakes or showed any consequence for the dangerous situation they were occupying.
So,no, there should never be a DLC that raises Aerith because that will, imo, contradict the entire point of the message.