Is it impossible for Sarada to get an Eternal Mangekyou Sharingan? According to the Naruto wiki:

Their vision can be restored by transplanting the Mangekyō Sharingan of an Uchiha with strong blood ties — ideally a sibling — thus awakening the so-called Eternal Mangekyō Sharingan

Since Sarada doesn't have any siblings, this means that the closest relative to her with the Uchiha blood would be her father. Apparently, since this is not ideal, does it mean that Sarada will never obtain the Eternal Mangekyō Sharingan?
It is definitely not ideal to give Sarada Sasuke's eyes for an Eternal Mangekyou Sharingan while he's alive. It is possible that she gains it while Sasuke is about to die (kind of like how Kakashi got the Sharingan from Obito). Another way would be to have a genetic clone (which would satisfy the condition of close blood ties) awaken a Mangekyou Sharingan and transplant it to Sarada. (Although the latter is highly improbable)