For me, if we win the fa cup and finish strongly in the league then he deserves one more season to get it right. Ive changed my opinion several times on whether he should go or not but for me especially with the two manchester games there have been significant changes. Ozil and Alexis have added some serious quality, Giroud has stepped up too. If we can attack second place and get that with a trophy then he gets one more shot.
If we limp over the line making the same mistakes as we have for the past few years then i think he should probably walk away but the manchester results, especially united, has given hope that Wenger is changing himself too. He is sticking to his principles but adjusting the tactics as well. If he continues to do that then one more shot. The proof will be in how many points we take against liverppol, chelsea and united. If we can get 7/9 then i think that is huge improvement