You do realise this team is predominantly made up of Wenger's players ? The same players that everyone wants rid of in order to free up the spend and build a new squad.
Emery is almost irrelevant at this stage. He's tried almost every combination with the resources he has at his disposal and, in addition, lost two key players in Bellerin and Holding for most of the season.
Some managers may have been able to tweak things a bit differently but no manager can polish a turd.