That isn't going to happen under Wenger. Remember when Ramsey had to play on the wing and he said in an interview something along the lines of Wenger telling him that he is on the wing but actually he can do anything he wants. Wenger just lets his players play. That's his approach.
Whisper it, but Pep would be good for Iwobi. Iwobi isn't on Sterling's level, but Pep would improve his positional play in a similar way to how he has with Sterling.