Having seen the AI up scaled versions of DS9, I would be surprised if that ends up being something I want to watch. I definitely don't see the point of changing the aspect ratio.
If we were to trust AI to do this, we'd need to build models specifically for this, with a way to give context to the rest of the set for the scene in question. From a technical perspective, I find the concept interesting, but from a practical sense, the amount of energy and time required to do this is almost a non-starter, and in doing this, we'd be going beyond the director's intent for the work at hand, which makes a transformative interpretation a degree or two removed from the intent of the director and production team.