Complacency kills many felines.
Of course they will. They will have a bagman deliver it quietly in an unmarked container ship, rather than a horde of planes with the Iranian flag painted on them, that's all.
You may be right, alas - that's why every US government from here forward needs to promise these various scumbags a policy of "multiple deterrence" -- if any WMD attack is conducted against the USA, here or abroad, from any unknown sources, then ALL of the scumbags will suffer retaliation -- Iran, North Korea, Syria, etc...... we can no longer afford the luxury of trying to figure out who has attacked us when 9/11 style attacks or worse can happen without any return address.
Of course, that is why pre-emption is more important than ever, though the Demagogues and their UN butt-buddies seem determined to tie down the USA's Gulliver in Lilliput.