Hopefully Sakura will reveal slug sage mode. Thats the best we could hope for. She has the chakra control for it and she is very familiar w/ Katsuya.
The slug sage mode needs to provide Sakura with these 3 things in order for Sakura to be respected as a Sanin student.
1.) A long range attack that is very fast and difficult to dodge. (Slug Acid but faster and more acidic than Katsuya, the slimy goop slugs leave behind as something that immobilizes/paralyzes and poisons your enemy)
2.) Same way Oro seems indestructible b/c snakes keep putting his body back together even if naruto in 4 tails mode slashes him in half, slugs should do the same for Sakura. Instead of clones she should be able to divide her self like Katsuya.
3.) Her healing abilities need to be sped up and amplified to be long range similar to how kabuto healed her after naruto hurt her arm in kyuubi mode but far superior for Kabuto. Maybe like a mass healing jutsu that doesnt require katsuya. That way she could save the entire alliance like Tsunade saved a lot of the leaf when Pain/Nagato attacked. You see alliance members get sliced but suddenly the wound heals completely.