This is not the end. This is the beginning of another Iraq war, set up exactly the same way: claiming, with dubious proof, an imminent risk from weapons of mass destruction. Iran’s options here are to bomb US bases, which are a lot closer by, mine the Strait of Hormuz, blow up oil infrastructure in nearby countries who are harboring US bases. This might risk Iran a much larger war but the alternative of doing nothing…
Its hard to think of a full scale war that was started by the U.S. that didn't have popular approval at the time it was launched.