At this stage, I do not believe it will happen...I believe in fact, we may be setting a fly trap in the hopes they will try it. We do not have to invade and take Iran. We do have to take down their nuclear program and hurt their military. If we do, Irean will implode IMHO.
Syria, we can decimate their military with the IDF's help in a fairly short time. Net result is that two of the largets supporters of terrorism in the world will get laid low and set back militarily big time...and Iran's nuclear progream will, in the mix, get set/bombed back twenty or more years, or better yet, permanently.
I like your take better, but we only have 120K forces in theater. Not a lot of boots on the ground should Iran come knocking. Hope you are right.
Syrian army is an absolute joke. They are purely there to keep the Assad dictatorship alive. It would be a massacre if they tried to take on the IDF or US.