He should quit right now, he has ruined his legacy.
This season is the biggest failure, you don't spend 110 million on strikers if you cannot get any good service for both, especially Aubameyang, he may be more clinical in front of goal but he is the one who is more dependant on services. Ramsey and Wilshere on their day are alright, but Xhaka has been total shit for a long time now.
Also not signing Salah was a mistake, we should have got him as soon as we had the chance.
And the way he handed Alexis Sanchez situation is the reason why we cannot win any games in 2018. After losing 3 1 and getting Aubameyang the players got cocky when they beat Everton. His comments after Sanchez left has come back to bite him.
Look at City, despite going on long winning run not once did they get cocky, they know they have achieved no PL as of yet, they still have Chelsea and United and Tottenham to play which surely will not be easy games, they will try their best to not slip up in those games, and they will try to compete in UCL. They are surely final material if they avoid Real or Bayern.
Best replacement? Antonio Conte 100%
He is a realistic manager, he may be negative towards his players like he was at Juventus but he is a manager with great experience. He can surely clean the mess at Arsenal and aim for a long term project, that's what I would like to see.
and if he goes who is the best replacement?