The cival unrest in Iran is itself an option to exploit, the more money and man power they pour in to quell the uprising the better for Israel. A new government however radical will inherit a weaker Iran. Israeli support for the people will cause the fires to burn even hotter. There is no adult sitting in Washington D. C. at this time, Israel is on it's own. This option is best, if Israel attacks Iran, no matter how much Obama condemns it, America will be seen as having given Israel the green light, and this will bring America into the fight, however unwillingly. Obama is a two dimentional novice politician. He would want to look strong and support Israel if he wants the Jewish vote and yet lose the Arab vote.
Beirut protesters must leave environment ministry, interior minister says (Reuters)
from the article: Israel can't launch strike against Iran on its own