After the Kages finish talking and head to the field for battle, how do you think it will go? First and foremost, Sasuke is an avenger. It has been noted many times throughout the series. After hearing what Minato has to say, he will want to kill Obito. Also, do you really think that the 1st Hokage would let Sasuke leave that cave if he decides to keep going down the path of Madara? I don't think Orochimaru can hold him. Here is how I think the final battles will go:
Hashirama Vs Madara: These two were destined to fight. These two will be fighting each other.
Sasuke, Kakashi and Minato Vs Obito: Sasuke and Minato both have a bone to pick with Obito. Sasuke will want him dead after he learns Obito is the cause of the fall of the Uchiha Clan. Since Minato is pure hearted, he probably doesn't want his former student dead, but will probably try to talk some sense into him with Kakashi.
Naruto, Tobirama, Hiruzen and everyone else Vs Juubi: With the Juubi not being controlled by anyone, it is free to do whatever. I am sure that these 3 and everyone else will fight along side each other and seal the Juubi.
Here is a secondary scenario of how it can all go down:
Hashirama Vs. Madara
Naruto Vs Sasuke
Minato and Kakashi Vs Obito
Tobirama, Hiruzen and everyone else Vs Juubi.
What do you guys think?