Madara might have pounced SM Naruto, but he won't be able to defeat BSM Naruto!
Even Juubito had a rough time going up against BSM Naruto and then he got his but handed to him by Naruto and Sasuke's BSM Susanoo. They broke Juubito's sword!
That being said, Madara might successfully take down the rest of the Shinobi Alliance and capture the other 8 Bjiuus, but he won't be able to get his hands on Naruto. Especially since Naruto has sage mode as well. So it's pretty safe to say that Naruto is the only one who stands a chance against Madara in a 1 on 1 battle.
On top of that, the Bijuu noted that Naruto was the reincarnation of Hogoromo Otsutsuki (The Sage of the Six Paths). So if Naruto awakens the Rinnegan, then the next few chapters will literally be an all out clash of the titans.
Without a doubt, the final battle in the Naruto manga will be BSM Naruto vs Madara!
The battle will probably be like Superman vs. General Zod in Man of Steel! I guarantee it!
Then again, Naruto and Sasuke (BSM Susanoo) vs Madara might just as easily happen, but Naruto vs Madara 1 on 1 is more likely to happen because let's face it:
1. Other than the Juubi, Kuruma is the strongest of the Bijuu and Naruto is currently Kuruma's Jinchuriki.
2. Naruto has Sage mode as well and can enter Bijuu Sage Mode at any given time.
3. Because of the first two that I listed, Madara is probably going to go after Naruto last after he gathers all of the other Bijuus.
Wrong, it was Naruto who was having a hard time against Juubito and everyone can see that. Now saying that, Naruto was never as full power, infact both times he went BSM he had to borrow chakra from Yin Kurama so wasn't even at half power due to Minato using some of Yin chakra plus they gave Yin-Yang Kurama chakra to the Alliance. However, even if he was at full power, he still wouldn't be able to beat Juubito. Why not? Simple, he have no training for his BM or BSM modes or how to fully use their power while Obito was trained to use yin yang and the Sage's jutsus Madara when he was 13-14 years old.
Give Naruto Yin Kurama which combines with Yang Kurama and at full power then maybe BSM Naruto can match Madara and that's without the Bijuus. If Naruto had training and could use his power to it's full potential then we would be able to see him do things that Kurama did as the 4 tails against Orochimaru. Like shoot his chakra arm that makes another chakra arm from the chakra arm and continue attacking the enemy. Or with one slash of the hand sends a powerful shock-wave which 4 tails used to wipe out Orochimaru's small army of snakes with daggers coming out their mouths.
Making the chakra around him more durable for a longer period, he did it for the alliances 2x to protect them and Version 2 has dense chakra protection.