I guess it would depend on what part of the story they might expand.
If the Itachi anime took off, then it could be early Team 7 NS moments.
Or it could be the intervening years between the end and when Naruto becomes Kage, when the novels were written.
Or it could be during the war arc, a filler arc before the end, or a genjutsu spin-off from the war.
Or it could be something new, that we haven't seen before: like some new character stumbles across the formula for the genjutsu and reinacts the whole dream world on the next generation, including Naruto and Sakura.
Or if they broaden the Itachi universe, making him interact with the Akatsuiki, Kabuto and Orochimaru, there could be some genjutsu sequences that come from those stories. Where Orochimaru is testing it out and a young Team 7 stumbles into it. And it's left to Itachi to save them, and return them to Konoha, forgetting their dreams and Itachi's involvement.
So there are thousands of ways they could bring back NS. And they did such a bad job on the ending — so many giant plot holes, including the genjutsu theory that the whole war is an illusion — there are just tons and tons of ways they could reintroduce NS to the story and have it still make sense, whether they give an alternate NS ending or not.
Hope this helps. It's a bit like coming up with fanfic ideas. But the ending was so slapdash and open, that it's not hard. The only thing that was focused on was Hinata's dreams and goals. Naruto, Sakura and Sasuke's actual interactions were left almost untouched. Just a few sentences here and there. And the forehead poke from Sasuke, which was a familial gesture, not a lover one, so it's easy to work around. But no big declarations of love, no big rejections. No nothing. It's still wide open if they wanted to change it. Which, if the money was there, I wouldn't put it past them!!
edit: We could even do a new thread for theories on how NS might make another future appearance in the franchise, if anyone else wants to. Be good ideas for fanfics, at least!
I'm with you on the alternate ending. but this thing about just showing NS moments and and still have it end on NH is just to wrong and cruel. why would you want that as a fan?? the ending will still make no sense and Naruto and Sakura becoming scum wont change.