Interesting Concept... Personally, I'm more for A re-construction type of approach like this than any 'memorial garden' Definately the best of the proposals IMO so far. (tho i think the design in particular could be improved)
Looking at things logically:
1.)Shining two flashlights at the sky for the rest of eternity is a stupid solution no matter how noble or inspiring it may have been at first.
2.)The mindless pandering and use of buzz words such as "wtc, 9/11, terrorism, terror"...etc by individuals and mass media that goes on every day are much more disrespectful to the dead than a new structure could ever be.
3.)The economy is in the shitter, A project like this would not only create demand in the short term, but also a long term financial stronghold (much like the former world trade center)
4.)America could use a super-structure. Lessons learned in building such a large "new millenium" type structure would be of great value as it would test our engineering abilities among other things. Self-sufficency challenges proposed by this wtc2002 plan may push development of new structures that produce less negative impact on the environment.
5.)Massive Individual Interest in such a project would help fund the project much like the 'space race' funded space missions through the apollo program.
6.)Everyone needs a little danger in their lives. Of course a new structure would have heighened security. (a forefit of our individual rights imo.. another argument alltogether) Chances are slim that an attack would be successful under new security sanctions. Take a chance, live a litte.
Anyway, thats what I think about the whole thing..