That being said, I'm sure you realize there are different types of wars, and if there will be any type of military action, it will only be in the form of 'round the clock' air strikes. There won't be any "Iraq invasion" type strategy here.
Iran's whole strategy for the past decade or two has been to make this type of war impossible. There will be no "limited" war, with only airstrikes (albeit, a lot of them). Iran will make sure everyone feels the pain.
The easiest thing I can bring up is the missiles. The US had total control of Iraqi airspace in 1991 and 2003 (and frankly, between them too) yet couldn't stop the scud launchers. So the BM force is survivable. Those BMs can retaliate to anyone hosting those aircraft - the Israelis, Saudis, Emiratis, Qataris, whatever. I'm talking strategic level destruction, with potentially thousands of BMs being launched, a lot of which will go to oil production facilities.
Speaking of oil, Iran can (temporarily) close the Straits of Hormuz with small mine laying boats and ships, as well as a huge number FAC and dozens of submarines. There are also a large number of coastal missile batteries. These assets could also threaten a US aircraft carrier. A Khalij Fars ASHBM could inflict an embarrassing mission kill. Closing the straits for even a week would decimate the world economy. The panic alone will accelerate whatever actual economic damage is done.
Not to mention Iran has a legion of proxies across the region it can call to its help, to cause absolute havoc for US forces in Iraq and Syria, as well as Hezbollah's obvious threat to Israel.
There could very well be a plan for a certain group within Iran (whether it comes in from Iraq or even Syria) that would be poised to take control of the government and the people within the ensuing chaos of multiple and crippling air strikes.
No chance. It has been tried numerous times by Saddam, and failed every time, in the weakest state of the government.
what's the most potent AD system in Iran, the S-300VM?
S-300PMU2.
Follow any missed targets with B1-Bs dropping MOABs on certain hard targets and escaping at mach-3
Mach 3??? No more than Mach 1.2, my friend.
So why would the aforementioned type of war not be a huge possibility with just the way things have developed in the last month
Because, like I said, Trump does not have the will. He ran the campaign to expand the Trump brand. Now he's in the white house he's getting slated by the media, congress, and is making consistently unpopular policies. The only way he could make it worse is by starting a big war. Trump is a huge narcissist and won't want to be barraged by the media any more.
Contrary to popular opinion, it is actually hard to run a war from a work standpoint., especially as a president. Do you honestly think Trump will put the work in? Or just sit in front of the TV watching Foxandfriends, tweeting to everyone to join him?