Naruto stated if they fight "again" they will both die. Do you really want it to end like that?
I would want it for sure. The only way of ending the cycle of hatred between Senju and Uchiha, no BS flower power ending where a foxboy changes the thoughts/emotions of billions of people to create some crap like "true peace".
You can blame Obito for beeing a bit emo over Rins death but he atleast realised that (qoute

"there is no hope" for something like true peace.
Anyways @ Topic: Sasuke will help for sure. Madara totally raped 5 Kages at once and didnt give a crap, he toyed with them and didnt unleash his full power (if it really was his full power) until the very end..and after that they didnt last a second.
Obito on the other hand toyed with Naruto/Bee/Kakashi/Gai for many chapters, all of them are Kage level fighters.
Obito and Madara together
easily equal more then 10 Kage at once..now add Juubi to that, the creature that once nearly destroyed the whole world. It would be crazy to say that Naruto will pull this off alone, it would be ridiculous even for plot no jutsu.