This is one of Wenger's weaknesses, He should be a bit more ruthless with experiments that do not work.
It's taken longer than 10 years and counting to see Walcott isn't going to be the superstar we all hoped.
Maybe I am being harsh on Wenger but he needs to be a bit more brave. And we have a lot of people on loans that we should just get rid of. Joel Campbell who I liked but if he doesn't see a place for him get rid.