Iran Peaked in mid 70s. And just like other countries that have peaked, Iran sees Nuclear technology (not nuclear weapons) as a substitute for Global Peak Oil that is expected between 2010 and 2015. Aside from clearing that Iran is not interested in nuclear weapons, Iran has also offered to share nuclear technology with Saudis. Plus a Saudi invasion by Iran would not be popular at all in the Muslim world. So its completely out of question. The rest my friend----DO THE MATH.
Protests in southern Syrian city after Druze cleric's death (AP)
from the article: Iran says French foreign minister stoking crisis with talk of war