How will he keep himself fresh? He's gonna play and will not play in half measures that's for sure. It's not in his nature. He can't move in January without Arsenals say so either, he has to stay the entire season if Arsenal insist on it. By that time he could have got us into the champs league and replacing him will be a lot easier.
If you're so sure of yourself then what may I ask are you doing on here?