Ole has got Cardiff relegated, he spent money and by admission of the fans his signings were absolutely shambolic. His highest managerial accolades are leading Molde to a league title being in bang average league that is a lower tier than the championship. Since Ole has come in we have played some of the most pragmatic football, he's made absolutely no changes to the application and approach we had to games under Mourinho, aside offering a counter attack. While Ole has done well for two and half months, his current run of form has overshadowed any positives (results not performances) during the honeymoon period.
Might I add that Klopp got Mainz relegated, despite having one of the best teams in europe Pep failed in the UCL for two consecutive seasons at Bayern. Judging by your assessment to a managers sustainability, neither Pep or Klopp would be worth a punt in addition to the list of names provided.
The point is you can find flaws in any manager in world football, but for the same reason you won't see Eddie Howe, Moyes, or these calibre managers at a Barcelona, Madrid etc is because they don't have the pedigree to spearhead success at those clubs. Solskjaer, coincidentally doesn't have the pedigree because we are a big club. Ole doesn't deserve three summer windows wasting financial resources, unachieving and then being sacked.
Everything being said is entirely hypothetical and subjective I do understand that but on law of averages I would rather the club be led by someone who can revolutionise our approaches vs someone who is simply applying a copy and paste strategy to the best manager in footballs history. We don't need a replica, we need a difference, times have changed. By giving Solskjaer time, I personally cannot see us doing anything other than challenging for a 4th spot.