Somehow I don't even feel like this is going to cheapen the whole arc. I just think Nagato's power level is well beyond 9000.

However, Naruto bought himself a huge burden. Rain is still a somewhat shitty place and logically he should save it very soon. I don't think we are really too well acquainted with the current political situation in the Naruto world but assuming Nagato still has a point, there must be lots of pressure between the countries and very few ways of solving things due to the heavy traditions of hatred and violence. But who knows, maybe lots of people are, in the end, tired of that violence.

I wonder if Nagato himself ends up dying like Konan suggested. Seems somewhat likely. If he decided to leave things in Naruto's hands, there's little for him to do anymore. The book only had one hero.