TYB!
POTUS' end-game with Iran is (IMHO) to destroy the regime's will & ability to export terror. The steps so far, taken in Iraq, have been to decapitate Iran's leadership of its outside forces.
POTUS' Dec 31st tweet was the signal to prepare. And it likely was aimed (in part) specifically at the people of Iran. POTUS is informing them that these upcoming days the U.S. will be giving them the opportunity to take control of their own destinies.
But it is up to them, their choice. And the U.S. will continue with the process of defanging Iran of its terrorist leadership with or without a popular uprising against the Ayatollahs.