> Saudi Arabia would exist with or without American support

At the same level? I have my doubts. If they weren't a close ally of the US, terrorist financing/leading stings would be going much further. Would they be able to do their thing in Yemen without US support? Or would they be a pariah on the world stage because of their acts, which are hard to tell apart from those of ISIS/ISIL? Not that I'm a big fan of the Iranian Mullahs and their backwards idea of how to run a society, but they appear somewhat moderate compared to the wahabi style.