If they rebuilt any supertall tower or dual towers there, it would instantly become the No.1 terrorist target for every nutcase on the planet. Everyone knows that, so I doubt they will rebuild any really huge structure.
BTW, as angry as I am about the horrific attack, and as sad as I am about the loss of life, I must admit that those two towers were an eyesore. Sorry, but I\'ve always felt that way about them.