It won't come back because Boruto is filler and the author thinks it won't make Sasuke much stronger but the reality is with Hashirama and Jugo cells the transformation will be the same as Hagoromo and Kaguya, Kabuto was so close to attain it, he only needed Sasuke's body, I believe that if Sasuke learns Dragon Sage Mode he will attain it, he has all the requirements.