The Iranian government has sworn revenge, as they always do, and although they can't stand toe-to-toe with the U.S. military, they have a lot of options for creating havoc. The could strike oil tankers in the Strait of Hormuz, which would create a recession. They could strike oil facilities in Saudi Arabia. They could launch missiles into Israel. They could ramp up their support for Shiite militias in Iraq. They could launch cyberattacks on U.S. computer systems. While they are no match for the United States, they are perfectly capable of initiating a broad spectrum of attacks on U.S. interests.
Looking at the Wiki page (which is never wrong) for Iran, it has a population of approximately eighty-two million, which would make an invasion of the country a harrowing endeavor. It is also less subject to factionalism than Iraq, which has three large demographic divisions. I doubt that any of our allies would join in with the U.S. on yet another war of choice... though the Saudis would cheer from the sidelines as Americans died to advance their Sunni fundamentalist cause in the Middle East. I don't think that even Trump is dumb enough to start yet another land war in Asia, but I have a suspicion that he doesn't have any plan for a follow up on Soleimani's death, that he is just spiking the football and thinks that he's won. Meanwhile, we're not in the runup to war, we're now in one- one doesn't just kill a high ranking military commander of another country and claim that it wasn't an act of war.
Perhaps my greatest misgiving is a sinking feeling that the American media will gloss over the costs, human and otherwise, of the wars that we have been engaged in since 2001, and will end up cheerleading for a yet another war. Already, a campaign of misinformation is being waged on the American public by administration officials, with Mike Pence attempting, poorly, to attach blame for the 9/11 attacks on the Iranians:
Assisted in the clandestine travel to Afghanistan of 10 of the 12 terrorists who carried out the September 11 terrorist attacks in the United States.— Mike Pence (@Mike_Pence) January 3, 2020
Not only does he get the number of terrorists wrong, but he completely ignores the Saudi complicity in the attacks.
As far as Trump himself goes, there's a tweet for everything, and the idea that he killed Soleimani to distract the public from his ongoing legal problems is not far-fetched.
I just have the feeling that the news media will screw this up again, and that we are entering yet another quagmire that will end up in more dead Americans. I also suspect that Trump and his cronies have invested in arms manufacturers' stocks, and stand to make a killing on the killing. I also believe that this misadventure could spell the end of NATO- to use a Yonkers-appropriate analogy, if your drinking buddy keeps starting barfights, you stop drinking with him.
Whatever happens, it looks to me like there's a supreme shitstorm a-brewin'. There's no doubt that Iran will escalate the conflict, and there will be, at minimum, the sort of asymmetric warfare that will disrupt the world economy. I haven't even looked at the price of gasoline today, and gasoline is far less precious than blood.