Although this https://peacelearner.files.wordpress.com/2010/01/edward-luttwak-give-war-a-chance1.pdf might be a good solution to the wars in the ME, it would not work as other countries would interfere so there is no easy solution.
MbS is a salesman https://www.theatlantic.com/international/archive/2018/04/mohammed-bin-salman-iran-israel/557036/ that is on a mission to restore the absolute power of the Saudi monarchy. That is why he is fighting corruption by preventing others from taking bribes etc, and only allowing such business practice for his own family.
When he speaks about Wahhabism he asks; define Wahhabism? That is not easy for a random journalist, but it is true that there are different versions such as https://en.wikipedia.org/wiki/Madkhalism and https://en.wikipedia.org/wiki/Salafi_jihadism just to mention two.
The monarchy started to lose absolute power during the Embargo, when the entire family tree got monstrously rich, and the monarchy had to make concessions to the religious leadership during the "Mahdi" seizure of the Great Mosque, otherwise the religious leaders wouldn't approve the use of force.
MbS is a statesman, he's already reclaimed absolute secular authority, and one reason for his large new planned city is to undermine the hold of the religious leadership.
Meanwhile Putin's a gangland leader out to pile up a huge fortune and generally **** with people, the Shiite-head is already an absolute theocrat and responsible for much of worldwide jihad, and Erdogan is the dictator of a dying republic, removing all but the trappings of the multiparty state, and like the other two piling up money in the process.
The Iranian mullahcracy should have been snuffed during the GWB administration, which also should have eschewed attempts to stabilized Iraq -- removing Iran's mullahs would have been a more effective route of that, but ultimately, who cares, provided we wipe out enemies of the US.