Former Prime Minister Olmert said as much, even referring to the number of cruise missiles that would be required. The main question is, can Israel manufacture these alone, without purchasing them from the US, the total number of missiles required being very large. Israel does not have to destroy or hit every nuclear facility in Iran, it only has to hit enough of them to slow down the manufacturing process and buy time. There is political turbulence within Iran that may finish the Ayatollahs regime, and also Obama is losing popularity and it is likely a Republican with an aggressive foreign policy will be elected next presidential election. So if the Iranian bomb programs are set back 3 years, in three years the next President will very likely be someone who will demand to see regime change in Iran, and who will insure that the US military eradicates this threat to the American people. Or Obama might see the light and bomb these weapons sites before an American city is hit by a nuke.
5 tourists rescued from Hebron after being hit by firebomb; 2 hurt (Haaretz)
from the article: Israel can't launch strike against Iran on its own