#3 Ged rid of deadwood
One of Arsene Wenger's biggest strengths as a manager has been his insistence on giving players chances to prove themselves and show what they are capable of. This has helped him foster many talented young players who have gone on to become superstars (Thierry Henry, Cesc Fabregas, Robin Van Persie, etc).
The nurturing talents of the great man have become an albatross in the final years of his Arsenal career as his trust in players has been met with disappointment. Some of the players he has given chances to have proven to be duds who need to be moved out of the club as quickly as possible.
For all the talk of passion and unfulfilled potential, Jack Wilshere has done little or nothing to show that he deserves to be part of the new team which Wenger's replacement will look to build. Injuries have taken their toll on the 26-year-old's career but his failure to improve combined with his wage demands should make it easy to move him on.
Others like Danny Welbeck (27 goals in 105 appearances), the aforementioned Mustafi and Chambers and Ospina need to be moved on and replaced with genuine quality.