I don't think that ole will be the coach of ManU for much longer. If they are not successful in their next two matches then he has to go in my opinion. Manchester just can not afford to miss the european championships for next season. I am also not really convinced that wayne rooney would be such a great coach for Manchester United as i am always skeptical about former great players that are now coaches because i think a lot of them are just not good as a coach.
There is no sense to give them a few more matches to prove anything. He had 3 years and didn't prove much. He is still a true United legend and as a manager, he did some good things. But tactically he is a noob and a big club like M. United looking for the best.
Zidane is not in competition. He wouldn't take the team in the middle of the season even if it's still at the beginning of the season. I read somewhere, he waiting for France national team.
Rooney, I guess it is not an option either. There is not enough time for a new manager to learn his job and bring some good results.
Probably the closest one is Conte, he has already given some indications that he is interested in the job. and he is best for the current situation to raise a team in a short time and make some instant results.
In a long term, Ten Hag is also an option. Probably the best choice currently, but he is taken, and it's not realistic to expect to resign at the current club, where everything is going well, and to accept such a demanding job.