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

His possession of the Rinnegan allowed him to establish ... sparing only his younger brother, Sasuke. This event casts a dark shadow over the series, showing the sacrifices made for the greater ...

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