In April 1991, after the Gulf war, Iraq was given 15 days to provide a full and final declaration of all its WMD.
There is no way you're going to have an event like 9/11 and expect things to remain the same. They killed 3,000 people in New York on that day, and if they could have they would've killed 300,000.
The purpose of terrorism lies not just in the violent act itself. It is in producing terror. It sets out to inflame, to divide, to produce consequences which they then use to justify further terror.
In retrospect, the Millennium marked only a moment in time. It was the events of September 11 that marked a turning point in history, where we confront the dangers of the future and assess the choices facing humankind.