@Green: A lot of that is pure speculation/assumption; and besides it doesn't matter change the fact that the only reason Naruto didn't die there is because it was worthless for Obito to do so.If he killed Naruto as a kid then notihng stopped Minato from killing him then and there. Obito wanted to separate Minato from Kushina. Had it not been for Obito, both Naruto and Sasuke would have happy lives since both would have their families. With Minato alive there most likely wouldn't have been any Uchiha massacre since he would know that the mask man isn't in the village since he can FTG the mask man to him or go to Obito himself and finish him off. Kushina was friends with Sasuke's mom so I see them finding a peaceful solution as friends. With both of their mothers being friends, Sasuke and Naruto would grow up friends as well. Sasuke would have Itachi, Shisui, and his dad to train him and Naruto would have Minato, Jiraiya, and Kakashi to train him.
Bad examples for the whole Nagato to Itachi crap when it's not Nagato under his own control fighting the way he would and it'a a alive free will Obito. Oh and if Kakashi killed Obito back when he was going to then Madara would still be an Edo Tensei and there wouldn't be a Kaguya so everything is moot since the war would all be focused on Edo Madara who was trapped in Edo Hashirama's seal. Sai was there and could have sealed Madara plus with Obith dead, Minato and Kakashi would have went to where Madara was right when Naruto went so Minato could have sealed Madara himself as well.
If Madara somehow got free, it would have been Edo Madara vs Edo Tobirama, Edo Minato, Edo Hashirama, Naruto, Sasuke, Kakashi, and Sai while the Alliance would be fighting spiral Zetsu. The Bijuus would also be free to help either group as well.
@Blue: It's true that Nagato wasn't in control but if anything Kabuto made him on killing mode, and still doesn't change the fact that Itachi bested Nagato twice. Yeah but Kakashi failed, so the rest of that doesn't matter. I could use the same void logic and say that Sasuke's life is what it is because of Naruto; for if Naruto was never being born then the Kyuubi Attack would've never occurred. That doesn't take us anywhere.
And it still doesn't change the fact that Obito trolled death many times/etc.