Actually I think Tsunade may train Sakura at some point, specially if Sasuke does end up with Orochimaru. Jiraiya would take Naruto again under his tutelage, and Tsunade would be all like "If you want to help Naruto/Sasuke, you can't keep at your level."
And then Tsunade would work Sakura's ass off and Sakura would be, if not great, better than she is now.
Hey, you have to admit she was downright freaky with that mast! I mean, who have we seen with that kind of strenght, Tsunade aside? Is it safe to say that since Sakura was able, Naruto and Sasuke and Ino and Hinata could do it too?
Hey, it'd be neat if she did have that kind of abilities. And I'd like to see Tsunade's training, I bet its real hard.