Naruto:
1.) is an Uzumaki, likely a highly durable shinobi;
2.) has mastered Sage Mode. Although without Kurama, I reckon his chakra reserves can accomodate Sage Chakra;
3.) has a rather strong element-infused jutsu, yet to be used at full power(debatable)
4.) has his nindo, which makes him stick to his words. He has his way on things;
5.) is stubborn enough to resist defeat in the hands of Madara;
6.) still has Sasuke and the alliance at his side. They will help;
7.) still has his dad who has the Yin-half of Kyuubi;, and
8.) has Kishimoto to defy the plot and Madara.