Their wealth is overrated - they run huge deficits and the writing is on the wall for ARAMCO
But they might kill (pun intended) that too.
Didn't MBS punish and bring back the head of their fund? I can't find his name quickly if someone else knows the facts - I remember reading an article about him being western in dress & manner, being openly critical as a family member can be. It might be Amr al-Dabbagh?
Was successfully growing their money and power until he was 'Ritz-Carlton-ed'
Also, these days, running huge, never-to-be-repaid debt seems to be the standard way to run a country, as exemplified by the US and most of the EU ... the other shoe seems to have a gravity belt, so ARAMCO might just be safe for a long time.