You could tell the story of the events after ROTJ and make it stand on its own. You could even improve upon the originals (a difficult task, but not an impossible one).
I would argue that it is literally an impossible one because people would never ever accept it as such.
I’m not arguing any of the three new movies are better than the OT, but based on the reaction to TLJ, it’s clear to me that no movie could ever eclipse the original in the “fans” minds.
I’m not sure how the “‘fans’ minds” feel about it all, but even the originals are just movies to me.
They are just movies, but I think it’s fair to say that they’ve elevated beyond that somewhat, they are almost modern fables now.
Cave men told stories and drew on walls, we have Star Wars.