The Saudi Riyal has been pegged to the US Dollar since 1986, as are most Gulf countries: UAE, Qatar, Bahrain, Oman. Kuwait was the only one to break it under pressures from the 2008 GFC. This is the historical backbone of the Petrodollar and has survived decades of political and financial strain.

Also, >It's just easier< strikes me as very fragile logic, because it is only True until it isn't.