The US could drop that 'son of star wars' nonsense now that we can see how the very everyday things such as planes can cause such heartache and havoc if there's someone with enough determination to kill.
How vulnerable do those two towers seem now? Something so huge, so important to the US economy and so full of people just have to be prime targets. Maybe, in the future, important workplaces will be smaller and more underground, and not displayed as icons of wealth.