To show he's outgrown the need for it, that he can still be good and strong for the village without being the face of it. He didn't need to be a Hokage to fight Pain and protect everyone and I've always wanted to see him get out of that shell. At that point in the story, and easily beyond it, the title was almost meaningless. Earning the affection of the villagers was the plan and he did that. If he loses, he'll lose gracefully, and should he struggle Ino would be there to pick him up. It was a lifelong dream, any tears he shed will probably be out of view from Sakura, it's her day and he'll want her to be happy no matter what. Unfortunately for you, Naruto needs Sasuke, and of this I don't think we can avoid. Sasuke and Naruto are pretty much brothers, it'll need to be resolved way later in the game but we're talking way later. Until he brings him back, I don't believe Naruto will ever be content with himself. A promise was a promise to Sakura after all. If they confront him again, Sakura will be there, and imagine the surprise when she's got her own little diamond on her forehead and may be the Hokage at that point, if not a Jounin/ANBU bad ass!
You have a way with words, what can I say? Lin's got so many obstacles ahead of her, not just Tenzin. Try selling her role as Tenzin's lover to Ikki and Meelo? Yikes. Jinora might be the most understanding of the bunch but it's gonna be haaaaaaaard work.