Even then,his eye maybe to big to fit in her socket.
That would be pretty comical.
"An old, dying Sasuke makes one last stand by plucking his eye out."
Sasuke: Sarada, you shall inherit my Rinnegan.
Sarada: (crying) O-okay father...
"Sarada pops one of her own out and leans forth to let Sasuke implant the new eye. As Sasuke attempts to slip the eye into the socket... it doesn't go in. Sasuke fearlessly tries again and again to poke it in... but it doesn't go in. Sasuke gets angry and starts stabbing her socket with eye in an infuriated manner.