I would give Emery a chance to continue working. Bring in his own players and players that believe in his way. These guys seem sub-standard and lack the hunger to achieve with him. They NEED to be shipped out:
Mhiki - Substandard/getting no value out of him
Ozil - Lack of hunger/getting little back
Xhaka - Substandard
Koscielny - Too old
Welbeck - Injuries/we can get better
Monreal - Too old
Jenkinson
Chambers - Substandard
Elneny
These can be kept as squad players but NOT STARTERS:
Iwobi - last chance saloon
Kolasinac - we need better to start
Guendouzi - still learning
Maitland Niles - pin down what role he is play once and for all. I like him at RB and would be a great backup for Bellerin. At some point he will get restless if he can't knock Bellerin to start. But this would be a good pair to have in that position.
We definitely need to by 2 or 3 starting attacking players to play behind our STs. Aubameyang for all his goals is not a good "footballer". He is a top class Theo Walcott. Not saying he should be binned but if he is going to be starting we need ball players behind him and for him to concentrate on making the clever runs and getting the goals. He drops in too deep to get involved but he is not that type of player. Laca is better at that. So we have to figure out how to get the best out of having them 2 STs.
We need 2 starting CBs and 1 LB. Ben Chillwell I like a lot. CBs that are commanding and vocal. We need proper captains in the team. Top quality at football and good leaders.
Generally the pace of the team needs to increase. All the new signings should be quick. I find that players like Torreira do better when the pace of the game is high. When it is slow and controlled like it was on Sunday he seems to struggle. We can't play this slow style in this league. Ozil and Xhaka slow us down so much it is frustrating. I hope Unai sees this pace issue and fixes it!
Tierney will be more affordable than Chilwell.
Above all else if we stick with Emery we must have quality wing-backs given the system he's best at employing. They provide the width, pace and attacking threat. Bellerin, Tierney, AMN and Kolasi would give us strength and depth in those two key positions. Then we just need lots and lots of better players in most positions.
Tierney
Tielemans (screw Leicester over)
Ismaila Sarr or Leon Bailey
Milenkovic, Zagadou or Mukiele (or maybe two of them somehow?!)
Holding comes back
Nelson comes back
Bellerin comes back
------------------------------------------------Leno------------------------------------------------------
---------------------Holding---------------Sokratis------------Zagadou----------------------------
Bellerin-----------------------------------------------------------------------------------------Tierney
--------------------------------Torreira-------------------Tielemans----------------------------------
---------------Nelson---------------------Lacazette---------------------------Sarr------------------