Zidane is not coming to manage Man Utd for sure because the situation of man utd is not good and a lot of politics is going on in Man Utd. And man utd is just not making the right decisions for a long time. So i don't think Zidane is actually going to associate himself with a club like that, to be honest. I believe Man Utd should be looking for other options because I don't think money is going to be enough to bring Zidane as the coach of the team. Zidane is probably the right person but Zidane will not want the job as far as I think.
Zidane won't come to Man United because of other reasons. It is not about the condition of the club which is not good or unstable. However, the politics or drama on Man United, can be one of the reasons. Zidane is a typical coach who wants to develop a team with his own style. He doesn't want to be intervened by the team management. If Man United management always have the intention to intervene anything to the coach, Zidane probably won't be interested. For now, I think Man United is better to keep Ten Hag as the coach. Just evaluate until the season is over.
I don't know if they can hold on to Ten Hag until the season is over. If they cannot get out of the groups in the UCL, this will probably be the end of Erik Ten Hag and he may have to look for another team. Manchester United, on the other hand, is looking for a new coach and I'm sure one of the few options could be Zidane. If Zidane wants, he will have accepted a difficult marathon for Manchester United.