Sakura fearing Naruto will die etc. reminds me a lot of his promise to her, and don't get me wrong, that was a great scene, but I don't want to see a helpless Sakura again. Hell, even that promise, even though I liked how emotional it was, slightly annoyed me: why isn't she stronger?
I love how emotional her personality is, I don't mind seeing her cry a lot, I don't mind seeing her self-confidence problems; however, I'd also like to see that strong girl who constantly says "she'll get stronger now, because she has to!". She needs development, and tbh, I don't see that in your theory.
What more growth do you want? The only way you can see her achieve the growth you want to see is if she kills Sasuke. That is one things she can't do. otherwise Naruto will still have to fight Madara and I highly doubt Sakura could take on Madara if she can't even take on Sasuke.
But you also assume that in my theory she is NEVER going to fight ever again. Which is not the case. I might have skipped on a few details, but I only focused on the ones I wanted to convey.
Remember that there are more enemies out there that she could take on. She might not be able to fight Sasuke, but she might take on one of the newly resurrected Akatsuki. The "strength" you are describing sounds like you want her to be emotionless and more of a slugging brute who punches people all day.
I can understand you want her to stop being in the side-lines and stop crying for once, but she is NOT strong enough to fight Sasuke and Madara. Even if she did, she would probably die.
The original Akatsuki are back from the dead thanks to Kabuto and chances are she is going to fight one of them.
Heck, we might see another Sasori vs Sakura fight.
I don't exactly know where you want her to developed because she is already developed. Not much left to say. She is more powerful than Tsunade (possibly) and more strong-willed. She hasn't lost her heart or her love and is opening up to Naruto. We KNOW she can kick ass when the time calls for it, save for Sasuke who she still holds close to her whether by friend or teammate.
All that is left is for Sakura to back up Naruto. To be the strength to keep Naruto going. If Naruto falls, chances are she will probably pick him right back up. She is the closest thing Naruto has in loving someone. She is Naruto life, as with the lives of everyone in Konoha. After she got over Sasuke, there is not much left for her to do except to support Naruto and his will to save everyone even if it seems impossible. Even she said herself "all I can do now is trust in them."
So tell me what other development is left for Sakura because I am confused by your development.
All I can tell by your post is that you just want her to get into a fight again and win again. To punch everyone and everything into oblivion. I guess she could learn more jutsu along the way and improve her already awesome skills. Possibly learn the slug contract? I don't know.