Eight years on and it seems that New York has rebounded quite well, even if Ground Zero still remains pretty much a crater. Seems Silverstein and the city and state of New York remain at loggerheads over how to pay for the redevelopment scheme. As an architect, I followed this redevelopment project closely. A very good special was done for PBS (Frontline I believe) on the battle between Libeskind, who won the competition, and Silverstein, who refused to pay him for his efforts, and worse brought in another architect to redesign the Freedom tower because he didn't feel Libeskind amply qualified to pull it off. Libeskind managed to fight for and retain the height of the building "1776" feet, because it greatly appealled to Bloomberg and Pataki at the time. Silverstein and the new architect, David Childs, wanted to make the tower over 2000 feet! In talking with Libeskind, he said that fortunately he was able to retain much of his vision for the ground plane itself, even if other architects were involved in the actual structures. I visited the site in 2008 with my family while on vacation in New York.
I'm not quite sure what the legacy of 911 will be. Similar battles continue to take place over the memorial that was chosen for the site. It is still temporarily housed in a building next to the work site. I suppose we won't have that needed sense of reconciliation until this project is completed, as Americans seem to need physical markers to recall the past, even something stamped so strongly on the collective conscience as 911.