And now..... sh*t's about to get serious.
There are plenty more stories to tell in the Naruto universe. I feel like most manga or anime series create worlds so vast that even after the conclusion of one series, another could arise.
this, i really think the Naruto world is so vast that they can tell plenty of stories, many not even based around Naruto, how bout a series of prequels showcasing the Third Hokage and his training of the sannin, or the Fourth Hokage training Kakashi's squad, or even focusing on some of the other villages, i honestly can see Naruto going on much longer than Bleach
Naruto is coming to an end in the sense that every episode/chapter brings a series closer to its end. They still have years of content though. The Ninja war has been going on for close to a year of real world time and they haven't even taken out a 1/4 of the characters that got brought back to life yet. They can/will drag this out for years and even once it's done there's nothing to stop them from doing another big reveal that buys them another few years.
Everytime there's been a chance to start wrapping the series up they expand the story out even farther. I don't think this will change until the manga becomes so unpopular that it's a waste of money to print it in Jump.
I think after the 4th Shinobi War, Tsunade will step aside for Naruto to become Hokage, and Part II will end, there will be a short itme skip, and then there will be Part III. The war ends with Naruto killing Madara with a Nine Tail Chakra Sage Mode Tailed Beast Wind Release Rasenshuriken. And maybe some ramen.
I think after the 4th Shinobi War, Tsunade will step aside for Naruto to become Hokage.
If Naruto becomes Hokage I think Konoha will sink to the bottom of the Ninja world. Can you really picture Naruto setting sound fiscal policies and all of the other non-"kicking ass and taking names" duties that a Hokage performs?