Ten Hag needs to be replaced.
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If they sack Ten Hag and get a new coach they might not have the desired results. I think sacking him now is gambling because a new coach will have it start building the club from the beginning. And I also think that Manchester United will get the best coaches at the end of the season. So they should be patient with the coach till the end of the season and if Ten Hag can manage to get the support of the players they might end up getting a Champions League slot this season.
Many United fans keep blaming Onana for the poor results of the club because of his constant mistakes. But they fail to understand that a weak team will make the goalkeeper to be prone to errors. A weak midfield and defence will open up the goalkeeper to constant attacks which will affect his confidence. I think Onana will regain his form if the club fixes all its loopholes.
I think if a new coach joins and starts building from now it will be better. Manchester United are out of the Champions League, and they are in 7th position in the Premier League. I don't think they can achieve anything this season. The maximum that they can achieve is to book themselves a spot in the Europa League for next season if they continue under Ten Hag. A new coach can also join and would probably have the same result. If they start building the team from now, it will be better and they can deliver it better from the start of next season.