That's such an unbelievably bad plan, it can't be stressed strongly enough how bad of a plan that is. Pull the rip cord in the summer for fecks sake. Making the decision later based on some results early in the season is moronic and pointless, unless your assistant coach happens to be Hansi Flick, and fully dooms another season to throw away status.
Because you know next spring, it then will be like, 'oh the new coach hasn't even had a transfer summer, can't judge him', and then you can repeat the game year after year. And who knows what transfer decisions you will have taken that the new manager doesn't approve of.
If you sack him now, he'll 'rightly' be out of a job too, 8th in the league, what's the fecking matter with your club, have you lost all sense of proportion?
8th will be beyond them this season if they don't get rid of him. He's hopeless
Realistically, if Arsenal were to sack Arteta then what would the plan be? It’s taken United 8 years to get anywhere near coherent again, and still not challenging for a title. We’re only seeing benefits now because we’re backing a manager and giving him time because he’s not a toxic mess or got no idea how to manage players at a club like United.
Arsenal are a good 5 years away from the top 4. Sacking the manager and bringing in someone else isn’t going to speed that up, if anything it will prolong the climb.