Performances aside, consider that their two biggest stars and best players are running their contracts down and heading towards leaving on a free, they seem to be selling players in the area they are actually weakest (Gabriel gone and Mustafi possibly going?) and they cant keep hold of players like Oxlade-Chamberlain despite a huge contract offer. It's only a matter of time until Bellerin buggers off, Cech retires, and players like Ramsay and Lacazette start getting itchy feet. All of that under a new manager once Wenger finally goes and with the board's historical reluctance to spend too much money, they will probably be left unable to completely overhaul the squad and might even end up as a mid-table team.