Ten Tails will Take Out Madara

When Nagato summoned Gedo Mazo in his flashbacks, Gedo Mazo was able to extract the souls of others.

I believe that the 10 tails can do the same, my theory is that when the 10 tails is in its final form it will be the one to dispose of Madara by devouring his souls. 

Now that the 10 tails is trapped, I think we will have several chapters of the Hokages fighting Madara, and Team 7 fighting Obito, and then the 10 tails will appear in its final form, and it will devour Madara's soul.

The Ten Tails feeding on souls would make it more demonic and give it more of a god feeling. There are many stories where a god feeds on human souls, plus this would be a good way to end Madara, by him getting devoured by the 10 tails, with how OP he is it would be kind of hard to have him be defeated and not make it look like a cop out.