The winning response to the article's premise. I do not doubt the fifth column is in place waiting for a signal. As it would be a political uprising, i.e., an Arab Spring, current US leadership would welcome it. No invasion forces needed, few if any shots fired.
Saudi Arabia is populated by Sunnis. Iran is Shi'ite. Regardless of the corruption of the Saudi throne, I doubt the Saudi populace would look favorably upon a Shi'ite coup.