I don't think Manchester united management is ready to fire Ten Hang because there is no perfect time to fire him than at the end of last season when clubs who were not satisfied with their couch fire them. Everyone expected to wake up to the news of Ten Hang sack but were all shocked hearing that he will continue as the head couch. He has a very good relationship with the management crew and that's what is keeping him. I quite agree that they have players who have potential but then injury is giving them tough time and Ten Hang on the other hand doesn't know how to make good use of the available ones with his preference and selection.
Problems with Manchester United were never down to just the coach, but for the past 4-5 years, everyone kept blaming the coach, not anything else. It started with club legend Ole, and it kept on going. When Ralf Rangnick took charge, he addressed a lot of problems, but the board found him problematic. But it's true that he was right.
On the other hand, Erik Ten Hag is a tactical coach. He really knows how to set up a team and beat them with tactics. He's been unlucky with injuries, and this is something we can't blame him for. He's been decent throughout his time, apart from the injuries his team went through. But yes, the standard is much higher, and I have a strong feeling they can turn it around this season.