And he slunk away like a thief in the night.
With that said, the original campaign plan that General Eric Shinseki et al came up with called for about 240-260,000 troops including a substantial support for Phase 4 and Phase 5 (the "day after bits") and that got him fired.
Rumsfeld and the rest of the head shed scrapped it.
The Actual CENTCOM Op Plan put down for OIF was for substantially less than 200,000, massively underwhelming Phase 4 and Phase 5 portion, and of course it came a cropper in execution. Even if Bremer was a freaking genius (which he was not) there was a distinct lack of structural support for the plan as approved and resourced.
And of course, this led to Patreus asking for and getting The Surge ... how many years later?
OK, I better stop, I am getting grumpy just remembering all of this.
Whomever want to invade Iran is welcome to build an Op Plan that can do that, but how many Arab nations (neighbors who have issues with Iran) are willing to expend their blood and treasure in such an endeavor?
If they won't cross the LD, why should anyone else?
I see the current form of conflict sustaining itself for the mid term at the least.