Personally, I think that this season's performances might do it. I think we could well finish mid-table. Its only likely to be the lack of CL football next season that causes any movement. AW seems able only to take decisive action when his own position is challenged - which is why we see RVP, Song sold, but mediocre, unchallenging players played on and on. I think his folly in thinking he can rely on the likes of Diably, Rosicky - hell, even Gibbs is going to be exposed this season, and I think he will run Cazorla into the ground, and Wishere will be played more than he should be played, coming back from injury. I think Giroud/Podolski will lose heart, Walcott will be sold, and Sagna might be the latest player to decide enough's enough.
Its sad - but I can see no direction but down, ATM. Match days appear to be holding up, so its going to take the harsh evidence that manager and team aren't capable of qualifying for CL football - when this is what is repeatedly relied upon by the club these days to justify its existance - to convince the manager to go.