It wont happen, Danzo's story is done when Sasuke killed him. Once a character is not important to the story anymore,tthey are not relevant.
Examples: Chiyo, Kimimaro
They died good deaths and their story was done. Chiyo redeemed herself by giving life to the person whos life she ruined(Gaara). Kimimaro helped Orochimaru one last time so he could have Sasukes body .
There are also chracters that were relevant to the story but Kishi is stupid not to do it.
Examples: Neji's father , 7 Ninja swordsman of the Mist
Kishi could have made a dialogue with Nejis father and Neji. I cant believe Suigetsu didnt get to have dialogue with the 7 ninja swordsmen and we didnt get to see Kakashis rampage against them.
There are also characters which were still relevant to the story and kishi brought them back because of that.
Examples:Itachi, Hanzo, Gaaras father,
Sasuke needed to talk to Itachi and find out the truth from him. Hanzo was just a very hyped character we always heard about and we finally got to see him in action. Gaaras dialogue with his father was good and we needed to know the truth of his birth.
There are also chracters that were a waste to bring back.
examples: Asuma, Dan
Asuma already died and talked to his team about their goals,bringing him back for Choji was stupid. No one cares about Dan lol. Madara still beat the shit outta Tsunade. So it was a waste.