The war with Iran will happen, it's not a matter of if but when. It's not just Saudis but that want war with Iran but Israel and Egypt as well.
i think you under estimate the Persians, they have been around for 3000 years, they are not like arabs, they are very die hard nationalist
besides, many countries will make sure america doesn't succeed, like china, pakistan and russia also the central stans like Turkmenistan and Kazakhstan etc as they will not want Americans in the Caspian region
on top you have a country that is massive, 80 odd million and will fight back
you need to read Persian history bro, they always bounced back every time they have been invaded
Allah has created certain races that just seem to bounce back from the bring of catastrophe, they do not end but always rise back
is the Saudis and Americans and Israelis could, they would have taken out Persia ages ago
sure the will poke Persia but remember they survived 9 years of saddam attacking them despite saddam getting massive material and even naval help from the Americans
do not right off the Persians and their ability to with stand hardship, these guys ran the world and taught Rome many lessons