I disagree that Arteta should be sacked, he is doing a wonderful job and he should be given a proper striker instead. With a proper striker (last I heard they were interested in Osimhen) they will be the winners next season, keep the same team and put Osimhen on this and they should be having very easy time winning the title easily.
Nothing is guaranteed in life of course, if they get Osimhen but plenty of injuries happens then even next year could be terrible for them. This year they had to face plenty of injury troubles, but they are doing alright so far. The amount of games these players play in a year is way too much, so injuries become a serious threat, maybe getting some good depth would help them better too.
What kind wonderful jobs Arteta has been doing? He wasted so much money for years, won like three non major trophies, and still stuck till this time. His performance in the club needs to be re-evaluated, and it's also a good decision if Arsenal part ways with him if he not deliver to the club anymore.
They have to think to stop tolerate him, and a risky decision must be taken. His time wasting and set piece club will never win the league trophy.