A simple GPS trigger could then detonate the container bomb, 20 times bigger than OKC, when it's in downtown Chicago or passing over the Golden Gate Bridge.
This will happen.
But as I said above, look at the bright side: the islemmings will have a few decades to adapt to drinking oil and eating sand.
It makes one wonder why this has not already happened. If Al Qaeda and the like really want to disrupt the world economy, then they could follow your script or numerous others involving dirty bombs, bio-weapons, etc. They could perform such attacks in several financial centers (i.e. NY, Chicago, SF, London, Bonn, Tokyo) simultaneously or in rapid succession. This would ensure all-out panic rather than just a dip in equity markets as the 9/11 attacks did. There would be no safe havens. If I put my "tin foil" hat on I could contemplate taking out the WTC so that I could profit from shorting the insurance/re-insurance industries while staging a diversionary, lesser attack on the Pentagon.