It actually depends on line of enquiry at any given moment. We don't want Wenger to stay just because of results; a large part of it is because it's *Wenger*.
This debate cannot be "won", I'm afraid. If we're doing well, He should stay. If we're not doing so well, He should stay in any case, because it's *Him*. On the other hand, He'll certainly be leaving soon-ish anyway.