AcidRain, the land in question belong to the New York Port Authority.
IMO, this is perfect. No, we don't need another massive building there, but to leave the land vacant in memoriam seems almost like a loss of will, backing down from the challenge the terrorists offered us, admitting defeat.
By putting this massive new building there, we are flipping a massive bird for all to hear.
"WE WILL NOT BE BROKEN!"
The lives lost that day were taken because someone chose to stab at the heart of American Spirit.
Let their memorial be the greatest display of American Spirit ever.