I think Naruto dying is best:
- Minato was Hokage; it would be bland to have a Hokage who practically looks similar to and uses similar techniques of the Fourth. If Naruto becomes Hokage, it would be like Minato was revived to serve as Hokage again.
- The theory that Naruto will become the second Rikudo Sennin is bad. Naruto (series) ending with Naruto becoming the Rikudo would just be bland.
- Naruto's death could possibly usher in peace, depending on how he dies.
Yep; Naruto dying would contribute to the series.