Sarada needs the Rinnegan if she wants to scale up to the stronger enemies in Boruto. She could obtain this power.

Different ninja eye techniques like Byakugan and Sharingan offer unique ... the chakra of the Sage of Six Paths, one can possess the god-like power of the Rinnegan. More so than other dÅ jutsu ...

By the time of his battle against Madara, Sasuke had already awakened the Eternal Mangekyo Sharingan ... Out of all the Rinnegan users, he is the only one with a Kekkei Mora eye.

Sasuke could finally regain his Rinnegan in Boruto. This power up could allow him to compete with other characters.