Would be great to see an open ended conclusion to the manga. To have the story of Uzumaki Naruto go beyond the conclusion of the manga would be a great ending, instead of just finishing with him becoming Hokage. I don't see the manga concluding w/ Sasuke coming back, so maybe Sasuke is still out there and Naruto goes on his path to meet up w/ Sasuke once again. Maybe Sakura leaves the Leaf as well, w/ Team 7 paralleling the Sannin.
As for who else would make as good a Hokage as Naruto? How about Kakashi, Shikamaru, Shikaku to name a few. Naruto may have all of this power and prestige but does he have what it takes to overlook the village and oversee the military branch of the Fire Country? He may be their strongest protector, but Kakashi and Shikaku, as prominent as their roles are in the village, are the truly perfect successors for Hokage given their experience, strength, intelligence.