Still a better plan than unit the nations for a short period of time, once Naruto and Co die they will start to hunt down the Bijuus again the whole cycle shall start again :sdo:
That depends if the world doesn't want to continue this peace. Nothing seems to suggest that it would end outside of people thinking that Naruto is somehow the leader of the Gokage. It's called cooperation for a reason.
Not to mention their ideals are passed down from generation, to generation. I have no doubt that this peace will continue even after they die. Even if one were to rise against it, who is going to stop the Shinobi Alliance?
The Uchiha's? The clan is done and the last Uchiha outside of Sasuke is going to be the Hokage.
Any other threats? They'd get slaughtered going against shinobi from the Five Nations.
What about if a nation decided to revolt for some absurd reason because they felt betrayed? If they decided to start a war, then what-ever left of the SA would stop them.
I do think though the best course of action would be to unite the villages under one rule, but you can't force that overnight. Which is why the Alliance right now is needed for any future progress. This kind of peace and stability is better in the long run.
The only true threats in Naruto right now are the Otsutsuki Clan. If Naruto and Sasuke don't stop them, there will be no one left. God knows the Indra and Asura line is ending after Naruto and Sasuke. Their children are most likely going to unite that line and it's game over from there :lol