Board Thread:General Mod Discussion/@comment-178.191.193.16-20190907141842/@comment-34030170-20190907152756

To my knowledge, the Orcs, Trolls, and the rest of Sauron's forces scatter in fear, and quite a few of them kill themselves. That said, I think they do still survive to later ages.

My assumption is that a story quest wouldn't interfere with the Fellowship's journey, so none of this scattering would even happen ingame. I doubt there'd be anything that changes the entire nature of the game.