Well, in some fanfictions, Naruto has been known to put salt instead of sugar in Sakura's tea. She takes a big sip and spits it out right away, which is quite funny. Also, he might play a prank where he makes it seem like Sasuke has a crush on Sakura by leaving fake love letters from Sasuke around. It causes all kinds of chaos and blushing between the two of them.
Perhaps it means that Naruto has reached a point where he's sick of the various fanfiction scenarios involving Team 7. Fanfiction can range from alternate universes to different relationship dynamics within the team. If there's an overabundance of a particular type of story, like ones that always make Naruto the underdog in a way he doesn't see himself, he might feel like he's had enough.
Naruto might team up with Gaara. Gaara has his own unique abilities with sand control. Together, they could form a strong duo for a secret mission, especially if it involves something related to the balance of power between their respective villages.
One possibility is that Naruto's Genin team would face off against some new and dangerous villains. Since Naruto has his own experiences with powerful foes, he would train his team to be ready for any situation. They could end up in a situation where they have to protect the Hidden Leaf from a threat that Naruto has a personal connection to, and his teachings would be put to the ultimate test.
The scenario where Team 8 saves Team 7 instead would be quite interesting. It could introduce new conflicts and resolutions, and potentially reveal hidden strengths of Team 8 that weren't previously showcased.
Kurenai might be a good sensei for Naruto's different team. Her expertise in genjutsu would be valuable. She could help the team develop their skills in this area, especially if the new team members have some potential in genjutsu. Kurenai is also very perceptive, which would be great for guiding Naruto and his new teammates through difficult situations.
Sakura would be heartbroken. She'd likely spend hours upon hours by Naruto's side, trying to jog his memory with stories of their adventures together. She might even get a bit overbearing in her attempts. Sasuke, who has his own complex relationship with Naruto, would be conflicted. He'd see Naruto's forgetfulness as a sign of weakness at first but then realize the importance of their bond. Kakashi, being the experienced leader, would start by observing Naruto carefully to see exactly how much he has forgotten and then start a systematic process of helping him remember.
Well, it could make the team more protective. Sasuke might feel a stronger sense of rivalry as he wants to be the best in the team even with Naruto in this new role. Sakura would probably be very motherly, always fussing over Naruto. And Kakashi would have to adjust his teaching methods to accommodate Naruto's new situation.
It could also be due to a major disagreement with Kakashi. Maybe Naruto has a different vision for how they should operate as a team or a particular mission that goes against his values, causing him to leave.