I honestly could see it at some point. Between the Grand Company dungeon running thing, Chocobos, Trusts, and the old SMN Egi AI, surely they have SOMETHING they could throw together to make this work at least semi-effectively. Just have the party leader set up the run and any NPCs would follow and react to them like they do in those pieces of content. The only think I'm unsure about is if the healer AI would know to heal other party members, since the AI for those things may only heal their person (though I think your Choco will heal other people in party...so that AI is already there). The only other issue would be programming to avoid mechanics, but I feel like that's already covered with Duty Support and Trusts.

I expect this WILL come eventually, just not sure how long.

The other thing I'd like to see is being able to do solo duties with parties of up to 4. I know at least one husband and wife that game together, and one reason I they didn't stick with FFXIV was having to split up to do any story solo duty instead of being able to do them as a team.