Noooo!
I really would hate Tsunade to come and tell "I knew sage mode all along". I would have been stupid not to use it so far. She almost died (toxic pollen) and she were not the one would could save herself.
Indeed Tsunade or Sakura could learn slug sage mode. This chapter could be a hint one would. Kishi likes to place hints everywhere. I'd rather think Sakura would. She's not fighting right now so she has time to learn something useful. Also in the Narutoverse, the olderly only improves themselves while the youngs (who do that too) also tend to be the ones that gain extra new abilities.
With sage mode (if it happens) I expect Sakura to make a very important move (like saving
Naruto's life once) but I really don't see her gaining back her place as an important character in the story, nor even beeing useful again.
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