Great article by Greenfield...they always are. I could lurk his Sultan Knish blog all day and will find something new. A decent guy, too, he's answered my posts on the Knish.
The Saudis and Iranians have been angling towards war since Mo was out there banging his 9-year-old wife, so this has been a good long while in the making. This will be a Sunni vs Shiite thing, and potentially decades to run out. It's like Iran/Iraq, only with more money involved, thanks to Obama. Advantage: Saudi and the Arabs. There are a lot more of them, and a lot more money (and weapons). This will trip before Iran gets nukes, because the Saudis are not fools about who it is Iran intends to use them on, and it ain't Israel. That's just crap the leaders of Iran tell their peasants to keep them believing this isn't going to collapse their annual Hajj. It will.
Both we and the Russians would be foolish to get involved in this.