Masakiri, unlike Naruto's situtation, with Sakura and Ino, Ino befriended Sakura, and the whole rivalry came about because sakura was a baka and decided to throw away the friendship because they both liked sasuke..and maybe ino can do thing better than sakura because she trians/practices a bit more than sakura... ... but anyways on subject, as for sakura being a healer, really don't see any real evidence that she would become a healer. I think if anything, sakura would fit most as a teacher, because more than anything she is just book smart, so she can be a teacher and teach future genin, seems fitting for someone like her