Hey I hope everyone has been well. Been back going back to NaruSaku for a bit, as we all do every once in a while. Sometimes when I think about them, it feels like that day the two final chapters dropped in 2014 and I'm disappointed all over again lol.
If SasuSaku happens in part 1 or early part 2, then yeah I can imagine NaruSaku wouldn't develop much of a bond. We can see their bond is non-existent post the ending and in Boruto as evidence for that.
Their connection and friendship for much of the series was on getting Sasuke back and as soon as Sasuke was back, they don't act much more than acquaintances. That's why I always thought the brother/sister arguments were weak arguments. I don't see one moment of them acting like best friends or brother/sister in Boruto.
Once you remove any notion of romance for Naruto and Sakura, then there is basically nothing left for their relationship for ikemoto or kishimoto to write about.