Great grandson of Naruto (the new reincarnation of Ashura) and the great grandson of Sasuke (the new reincarnation of Indra). Their lives are totally different than Naruto and Sasuke's, since Naruto and Sasuke restored the Uzumaki and Uchiha clan, they have clans. Also, peace has been in NV for a long time thanks to Naruto and Sasuke, but some new evil dudes show up. I think Orochimaru should still be alive and be stronger than ever, and he has his own group of criminals. Idk any other ideas than that though.
Oh, another idea: In an attempt to bond the ninja nations together, all the nations and villages decide to create a boarding school where students of any village all over the shinobi world can enroll. In this school, students are taught jutsus of every village to show that each village trusts each other. Classes of senjutsu, ninjutsu, genjutsu, taijutsu, medical ninjutsu, kekkai genkai, dojutsu, shurikenjutsu, etc. are taught here. More tournaments will be in this series, like the chunin exams, and it would be more about school life than war.
What do you think of that idea?