Personally, I think zone 6 is at its best in its postgame state. I would despise reverting it.
It's a dead world, manifested as, essentially, a closed theme park. The lights are off, the stalls are closed. This land, once full of life, joy and activity, has just... fallen silent. Its musical theme is distant and faded. Everyone's gone... but the place they loved and lived in still remains. When we first entered, it was a theme park for ghosts; now, the theme park is a ghost, too.
I find that far more beautiful than when the lights were on.