Like... Sakura knows she's infertile and has worked out a dark plan to steal some of Karin's viable ova so she (Sakura) and Sasuke can at least create the illusion of having a child together. No one will dare question their love, even when the child looks exactly like Karin.....
Sigh. /sarcasm
Could be something like this: Sasuke puts Sakura in a genjutsu and makes her believe they had sex, she got pregnant and had a baby while in reality Sasuke sleeps with Karin, whom he actually has some feeling for. After the child is born and bestowed with a stupid name, he brings Sakura out of the genjutsu. The scene plays out...
Sasuke: Behold our wonderful child, Sakura.
Sakura: Er, she doesn't seem to resemble me in the slightest way, does she?
Sasuke: Shut up kitten, and clean the house. I'm going out on a journey of atonement with Karin.
Sakura: Yes, master.
Sasusaku - the definition of true love.
Ugh. It's sickening. It really is. That Naruto had to get over Sakura at all. The REAL Naruto would have never gotten over Sakura no matter what. Fuggin' studio pierrot knew this and that's why they had to come up with that weaker than wet tissue reason of why Naruto "never loved Sakura" in the first place. I hope studio pierrot goes bankrupt and disappears from the face of the earth.
Actually, it turns out that Naruto's famous nindo never existed. Like his "love" for Sakura, he only invented it because he thought it was something that Sasuke would say, and used it for the sake of competing with him.
If Kishimoto had really played up the mental and personal tole being a ninja could have (including being a medical ninja), it's not hard to imagine getting fried doing what she does and wanting to move on, regardless of where that would. be
However, Kishimoto didn't write that and he cannot suddenly play that for the one character who was always playing catch-up while have her male counterparts have no such issues.
I think history has shown that Kishimoto can write anything he wants for any character for any reason, regardless of what he wrote for, say, fifteen years prior. Don't worry though, he'll explain how everything came about with a new movie, some extra manga chapters, side story manga and maybe some light novels written by authors who suck slightly less than Kishi himself.
I think you and Moongirl have a different definition of 'moving on'.
While it is true that Naruto would have stepped aside for Sakura's happiness as you said, it doesn't necessarily mean that he would stop being in love with her. I think that's what Moongirl meant by 'not moving on'. Her definition of 'moving on' is based on whether the character is still staying in love with or not. And I agree with that. In the Narutoverse, it doesn't seem to matter what or how the interactions between those two characters are. If character A loves character B, then they just do. Jiraiya will still be in love with Tsunade regardless of her not reciprocating for twenty years, Hinata will love Naruto regardless of being ignored, Naruto, Sakura and Karin will love Sasuke regardless of being nearly killed, Haku will love Zabuza regardless of being used as a tool. Moving on, as in stop having those particular feelings doesn't seem to be possible in the Narutoverse.
True, except that Kishi avoided the whole issue by retconning Naruto to never have truly loved her at all. It was all out of competition with Sasuke. You know, getting under your rival's skin by going after a girl that he cares absolutely nothing for in the first place. It's just sound logic.