Rouhani's term will end in 2021. I doubt that technology would advance so fast so much that it renders all of our defense systems obsolete.The zionists war on the moderates is going to produce another traditionalist, which is what they want when war starts. For years Iran has had the chance to develop nukes, and if war broke out only cheap old tomahawks would be used. By the time Rouhani is out of office, there could be newer weapons that can knock out the ADS of Iran.
So don't expect a war in the Rouhani term as President. He has wasted Iran's time to defend herself with nukes as a deterrent. By the time Iran has a willing President to defend Iran permanently with nukes, not temporarily with Bavar 373s, it's too late.
The chance of war is low in my opinion. And don't forget that the same things were said when Iran signed a nuclear agreement with E3 in 2004. Almost everyone said that they would attack Iran when Ahmadinejad took the office. Ahmadinejad ended Iran's compliance to the 2004 nuclear deal and increased the number of Iran's centrifuges from 24 to more than 9,000 centrifuges.