I don't believe the O.T. prophesies for Isreal apply to the U.S.
As President Bush has said, 9-11 was the work of the Evil One. The human race insisted and got free will from the Lord. The work of the terrorists wittingly or unwittingly following the path of the Evil One was not the work of God.
Culteral rot is setting in the West as evidenced by secularism, materialism and the sexual revolution. A revival of faith among all religions would help us recover from the decadence setting into our society. All this was apparent to any observer before 9-11. The attacks did not convey this message, which is why the nonexistant "message" was "missed."
Curiously, the same "message" thesis is coming from the secular left; that 9-11 is the result of blowback from decades of evil American policies like capitalism, imperialism, interventionism, globalism, "supporting foreign dictators," or supporting the mujahadeen against the Soviets. The left says the message of 9-11 is for the U.S. to change policies and embrace the agenda of the lefties. Both extremes say the same thing, 9-11 is a message that you'd better support my agenda or be destroyed.
The real message from 9-11 is the one we can see in front of us without "missing" it. There is evil in this world. There are enemies in this world who hate us with no moral or rational basis. We must defend ourselves from this evil. God will comfort and support us in our grief and in our struggle against this evil.