I was going to disagree with you, but without 9/11, GWB's neoliberal bullshit probably wouldn't have kicked into high gear the way it did to try to keep people spending after 9/11, so maybe the bullshit leading to the 2008 gfc wouldn't have happened, which would have resulted in a totally different timeline.
Discussion
Yeah I don't think the housing crash and the world trading centers being destroyed were totally unrelated. Those buildings were chosen for maximum financial system impact it so I hear.
The world trade centers themselves would have had an impact, but the transition into war spending and the modern security state both had major costs that had to be borne by society just as the dot com bubble collapsed hard, so the central banks were trying to help keep the money flowing in a way they probably wouldn't have if the country hadn't just been attacked.
In a lot of ways, 9/11 was a rather successful attack when you think about it.