You mean considering justifying the SS ending a bit more?
One change he should consider, to fix really, one of the struggles he had, which was the execution of Team 7, is to have Sakura go with Sasuke early on. She'd function as the light in darkness sort of thing, and it would give her a different angle to the Sasuke common ground she shares with Naruto, and she'd be actively trying to keep him from going too far. They could do this in part one or part two, though part two would be neater.
You could do that, it would kinda work. But it wouldn't be that great really.
The most important thing is: It would take too much from Naruto. The whole NaruSasu thing would fall apart.
And Sasuke would get way too much focus at that point.
Another important point: Sakura at that point knows nothing about Sasuke and doesn't really care about him. She makes it clear with her speech and that she doesn't tell anyone, that she only wants it for herself. And that doesn't really change. She can never understand Sasuke like Naruto, she would never become the 'light'. You would have to change Sakura background and character up to that point to make it work.
Most importantly: Sasuke was never really in the darkness till he killed Itachi. We were shown his human and caring side over and over, till he faced Itachi. He was calm and calculating, but not insane. Sakura going with him wouldn't change a thing.
And you would have to change Sasuke extremely to make him let Sakura come with him. In no circumstance I can imagine him allowing or wanting that.
Edit: Oh, what I forgot:
I think it would actually kill the entire Team 7 dynamic. Plus only one member remaining and it all solely revolving around Sasuke: A really big mistake.
It would be like destroying half of the series only for one unimportant pairing really.
Edited by Aevrum, 08 August 2017 - 01:51 PM.