Okay...so what happens to our troops in Iraq if a war with Iran begins?
How will the military deal with that fiasco, especially since the military leaders have let it be known in no uncertain terms that they have no confidence in the Secretary of Defense?
Maybe the regime is starting to self destruct and beginning with military dissatisfaction If you cannot manage a disciplined and loyal group like the military then maybe this is one of the best signs yet that this menace will not last forever.
To answer your question, maybe there will no Iran invasion if the generals can influence in any way possible this regime. The generals just might be the key to success here.
But, then of course I am a bit of an idealist. The invasion of Iran would likely involve less troops and more of things like air power and nuclear weapons. Certain interests want Iran invaded, no matter what.