Saudi Arabia Would Support An Attack On Iran

We already know Israel has made it clear to the world they will attack Iran if the US doesn't, for the first time perhaps ever, Saudi Arabia finds itself siding with Israel on many issues in the Middle East, especially about the dangers of Iran.
With Iraq in the Iranian camp, Venezuela coalescing with Tehran, Iran could come to dominate OPEC. That is something Saudi Arabia and the Bush Administration can't afford. This problem is largely the creation of the Bush Administration. With Sunni still in power in Iraq, Iran is still contained. Bush et al has loose upon the world the real bad guys.
PINR

[...]although official statements appear to be oriented toward positive relations, the geopolitical and ideological struggle between Iran and Saudi Arabia is a reality inside the Middle East. Iran is on its way to becoming a major regional power, and it has joined forces with those entities that are unsatisfied with the present balance of power in the Middle East: Syria, Hamas, Hezbollah and Iraqi Shi'a factions.


Saudi Arabia, on the other hand, is searching for a new, more incisive strategy to counter the Iranian challenge. Riyadh is allegedly supporting Sunni actors in Iraq and is supporting the enemies of Hezbollah and Hamas. Saudi Arabia has also tried to prevent the United States from engaging Iran diplomatically since such a development would reward Iran by allowing it to achieve U.S. recognition as a permanent player in the region.


Therefore, as Iran continues to pursue increased power in the Middle East, Saudi Arabia will continue its attempts to subvert that power. The clash of power and interests between these two states will likely grow in the coming future.