Reasons why NaruSasu won't happen:
1. Kishi isn't gay
2. Naruto isn't gay, this pretty much takes it on it's own
3. Why would they promote homosexuality at that age of audience?
You don't have to be gay to write about a homosexual couple :| A lot of girls write yaoi yet they are straight themselves. There are even boys who write yaoi who are straight. There is no rule that says you have to be gay or bi to write about yaoi or like yaoi couples.
Again, nowhere it is literally stated what kind of orientation the characters have - it's just assumed they are all straight because romance isn't a big part of the story and it focuses more on action
Why would it be promoting if they end up together? Then I would have to say that every serie which ends with a straight couple, that it promotes a straight orientation.
Besides it would maybe help people to be more tolerant towards people with another orientation. Not saying they are going to end up together though. Maybe they even die *shrugs*
OT: Sasuke would probably be insulted if Naruto tried to save him, so he would probably tell Naruto to save Sakura while he saved himself