I think Arsenal have been confronted with an exasperating paradox for many years now.
On the one hand, Wenger has refused to face the realities of the current transfer market and pay enough to recruit enough top players. This has left us incapable of challenging for major trophies and is responsible for our barren period. This is a good argument for letting him go.
On the other hand, if we did strengthen sufficiently ( let's say for the sake of argument we brought in Benzema, Ozil and Di Maria), then THERE IS NO-ONE I WOULD WANT MORE TO MANAGE THIS TEAM THAN ARSENE WENGER!
I think this paradox illustrates the problem with the structure currently in place at Arsenal. In my view the extent to which Wenger is involved in transfers should be writing up a list of players he wants in every position he wishes to strengthen. That's it. No "deciding the value of players" and no "finding internal solutions."
Arsenal have become a victim of Wenger's previous success and he has far too much involvement in almost every aspect of the club. His responsibilities need to be reduced to managing the team and selecting possible reinforcements. Everything else should be taken out of his hands. If he is not willing to accept this arrangement, then its time for the club to move on and drag itself into the present.
I will stop short of calling for his head until the 3rd of September. If he strengthens properly then fair enough, if not, it's time for him to go.