The way the game is currently set up I believe AI vs AI is possible with a few minor tweaks and may be coming eventually since I’ve seen a couple of people request it. (I could be dead wrong, AI is my least favorite part of programming)
As for Local or Peer-to-Peer (Local Host as you call it) multiplayer, I doubt that it’s a feature that will ever come considering the amount of work it would take on the devs’ part and what I would imagine would be pretty low demand for the feature.
Local Multiplayer could potentially be possible through a mod if someone were to put in the effort for it one day. But I can’t imagine how it would work.