While possessing the eye doesn't reveal any new paths, it does cause a few ghosts to show up in the mines. It doesn't cause any ghosts to show up in the ruins of Stonybrook Village, though.
As
Raicuparta pointed out, the future area can be interpreted as supporting either one timeline or multiple timelines resulting from time travel. The absence of ghosts makes the one timeline interpretation the more credible of the two, though I think it remains open-ended.