going on the premise that the 4th Hokage was Naruto's father...

I'd say that yes, Naruto will ultimately become Hokage. Furthermore, the crisis with Roots and Akatsuki nearly capturing all the Bijuu for their world domination plan create a very real threat to Konoha. It's not the same thing, but these threats, plus Orochibuto, put Konoha in about as much danger as they may have faced in the Great Wars.

Also, aside from sealing the Kyuubi and preventing it from destroying Konoha, what exactly did the Fourth Hokage ever do that was so great? Naruto may become as young a Hokage as he was. He's certainly doing well with jutsu, given his mass Kage Bunshin ability and his new Whirlwind attack, improved on the Fourth's Rasengan....

Besides, Naruto sorta saves Konoha from being destroyed by the Kyuubi if he can keep it under control, right?