Do you guys remember the Sasuke and Itachi vs Kabuto little mini fight and at the end Itachi ended the edo tensei? I know I sure did. Well what if instead of that happening Sasuke totally out of nowhere kills Kabuto thus making the Edo Tensei impossible to stop?
What I think would of happened: Sasuke vs Itachi part 2 maybe. In addition to that I think the entire World War(w/e you want to call it) would be a lot more interesting. Let's be honest if the Edo Tenseis still were there. The entire army of the Allied Nations would be missing a lot more fodders and even key characters. It would also develop Sasuke's character a little bit more.
Well that is what I think if that were to happen. Don't say "well it didn't happen so it doesn't matter." Let your imagination run wild for a little bit. See what kind of scenarios you can think of and let me us know.