The 6th Hokage slot is Kakashi's since it was already nearly assigned to it. and I can't see Naruto getting the 6th title when it was already held by two people temporarily. Moreover, if Tsunade dies in battle (as unfortunately seems likely), Naruto will refuse the title, because he hasn't saved his friend as yet.
So I expect Kakashi to hold it for a short while, then after the Sasuke/Naruto conflict has been resolved, Naruto becomes the 7th Hokage. He'll be mature enough by then.
As for the other candidates that were proposed:
-Itachi - is going to disappear when the ET is dissolved. He would not be the right person anyway, having killed his clan and set his brother on a destructive path.
- Konohamaru - too young.
- Shikamaru - He is a good fit for an advisor role, like his dad, but lacks the power and charisma (or motivation

) for the Hokage role.
- Shikaku - not strong or motivated enough. Should have advisor role.