~~~
Getting the coach fired by management by implementing a scenario like that is considered successful because this strategy has happened at several clubs. As a Manchester United fan, I hope that doesn't happen and even if it is done for the better of the club, I don't mind.
Thankfully that's not true, but I still think otherwise. Hopefully that's not true, I think that's what Mourinho experienced a few seasons ago if I'm not mistaken.
~~~
Manchester United is busy with internal problems. Maybe you already know about the issue of buying shares. It's possible that this will be exploited by a handful of Manchester United players who don't like Erik ten Hag. When the situation is like that, the successes that Ten Hag has achieved, such as bringing Man United through to the UCL, are no longer cared about.
I think it was a failure on the part of the Glazer family. They don't want to sell 100% of Manchester United to another owner, clearly that has hampered Manchester United's growth in the long term even though the new owner may not necessarily be better than now.
~~~
I don't agree that ETH should be fired from Manchester United. In my opinion, the worst situation at Manchester United recently is not only the coach, but all the players must be responsible for their own play.
So if I look at Manchester United as it is now, it is more or less the same as what Liverpool experienced last season because of the storm of injuries at Manchester United. The players were also exhausted last season from playing 4 leagues and a World Cup which made the team's schedule worse until Manchester United played eight times last February (this is just an example). Manchester United just needs time to recover, so they have to give ETH the opportunity to build a strong squad.
The storm of injuries you mentioned only affected Manchester United defenders, but other players could certainly fill the void well. The striker's performance clearly needs to get the spotlight because their performance so far has not provided big benefits for Manchester United. They only scored 9 goals in 8 matches, what a different look compared to last season.