You gotta give credit to Madara, he can even smile when he acknowledges that he was almost killed. It's great for Guy that even a villain like Madara acknowledges his ability with taijutsu. Even Kakashi who pretty much took Guy for granted realized his father was right about him.
Guy is in bad shape, I don't think even Naruto is capable of saving him, he might have just prolonged his life long enough to give his final words to his friends. I can't imagine Guy wanting to live with those injuries. It must be painful beyond belief.
I wonder if Obito sent just Naruto back or if he and Sakura came back too. If Obito did come back he will be weaker again because he gave the bijuu to Naruto. Black Zetsu will probably give Madara his other eye now. Which will give the now weakened Madara enough power to put up a good fight against Naruto and Sasuke. I would imagine when Obito dies he will give his Sharingan to Kakashi to replace the one he's going blind in.