Ten Hag is not a bad coach , the only problem with coach he doesn't know how to use his players well. When a player is not doing well the best thing to do is to look for an alternative to see a better result. If there is no better improvement for Manchester United this season I think their is a need for a new coach to bring up something different.
There are not many quality players in Manchester United and Ten Hag already tried to rotate many players in many positions, but the results weren't going well. I would say the situation is kinda fucked up, Ten Hag can't do more experiment and Manchester United's performance is still awful.
I expect Manchester United will suffer many losses and draw till the next transfer window opened.