We don't know that yet. It's quite silly to write him off this early.
I agree that the recent benching was needed to give him a wake up call. I do think, however, that with so much football still to be played, Louis needs to play him through long periods of frustration and not drop him for spells at a time every time he doesn't deliver. He's a very raw talent who needs consistency in game time in order to reach maturity. If we play him inconsistently we'rr most likely going to end up with another Nani on our hands because we stymied his development.
We need to show patience and belief that he will improve because he will once he matures like Ronny did. He clearly has a lot of growing up still to do, and it helps that we brought in a player like Bastian who's a leader with plenty of experience.