you know, the Gulf states and the SE part of Saudi Arabia has large Shiite populations. And one of the reasons that Bush senior never overthrew Saddam was because Iraq is 70 percent Shiite, and they worried about a Shiite Persian empire taking over the area.
If Iran gets nukes, the Saudis will buy a couple of their own.
Remember, wars in that area go way back...and they remember ever one.
This is all about control of the two holy sites
currently by the Saudis, but which the Iranians
would love to displace.