In regards to Sakura, even though I'm not a fan of her character I do keep in mind that Kishi's idea of heroics, specially pertaining to women in his manga are different from mine.
What he hinted during the latest JF interview about making her character more heroic ( he knows people don't like Sakura that much, he said so in the interview. Not directly but in contrast to other females, specially Hinata )
has been fulfilled. She was willing to put Naruto's well being before hers for once, and put her feelings for Sasuke aside in order to do what she thought was the right thing.
But in the end she couldn't do it, and as you mentioned her dialog seemed to be her taking a bow out of the only real plot shes connected to.
That is quite frankly more than one could hope for realistically for her, in terms of being heroic. People waiting for her to level cities like the haxxed big boys will be disappointed.
In part 2, romantic feelings have just been used a melodramatic plot devices... They aren't really adding anything substantial to the story, like they did for me in Part 1.
No expectations = no disappointment.
Pairings will happen, but not how the fandoms expect.