The story would change the perception of heroes. Naruto was seen as a hero, but if he's sealed away, it makes people question what it really means to be a hero. Does having great power automatically make you a hero or can you be turned into a threat? It also affects the future generations. Young ninjas who looked up to Naruto would have to find new role models, and the ninja training and values might shift as a result.
Well, it changes the power dynamic. With Naruto sealed away, the villages that once relied on his strength would be in a more vulnerable position. His friends and allies would also have to find new ways to protect their homes. It might lead to new alliances forming as different groups try to fill the power vacuum left by Naruto.
In this fanfiction, the sealing of Naruto could potentially lead to a darker Naruto universe. Without his positive influence, there could be more conflict between the villages. Also, the villains who were once held at bay by Naruto's power might become more bold and start causing more chaos. The whole social and political structure of the ninja world could be thrown into disarray as everyone tries to adapt to a world without godlike Naruto.