What Arteta has done well is to build a top quality squad. He shifted the garbage by taking an incredibly hard line with under-performers. He took a hard line with the players themselves and also with upper management by essentially forcing them into action. The management team backed him because they bought fully into his vision and that has helped accelerate our progress tremendously. Had we had a weaker personality who was willing to compromise a little bit more in charge instead, we would probably still have the likes of Pepe, Guendouzi, Bellerin, Auba etc. floating around.
That's what he has done - he's given us an incredible base and unfortunately that has bought him a ton of goodwill meaning he will only be shown the door if shit thoroughly hits the fan. I'm not advocating for him to go btw, am just saying that third/fourth in the league and no trophies this season will probably not be enough for us to go a different way.
We've just to hope he gets us into gear sooner rather than later because the league is hyper competitive and I fucking want to win something big (CL, PL) this season.