I do not understand some people saying we should sell him for £40 or £50m and be done with it.
With Alexis, chances of re-qualifying for Champions League are infinitely higher than without him. CL Quali should bring in at minimum £35m and could easily rise to £50m and higher.
Trying to replace him with a player of the same caliber is virtually impossible with Arsenal's finances. Besides, there really aren't that many players out there who hold up to Alexis.
With Champions League comes the benefit of being able to attract better players next year.
If we let him leave to ManC, we stand the change of getting 5th place, right behind ManC. Why would we help out ManC for that money if in the end it would have been a 'wash' ? No brainer to me. I fully understand Arsenal Wenger when he says Alexis is not leaving.
I say keep him and let him go on a free if he wishes to do so next year (although I hope he gets to his senses and signs a new contract before December).