I think the architects and engineers are the center of the movement. The average person is certainly not going to believe some "conspiracy nut" but they might believe (or be open-minded enough to listen to) a scientist. Personally, I never gave any serious thought to 9/11 being anything other than what we were told until I saw that PBS documentary "Explosive Evidence". The truth is that I can't say for sure what happened but the fact that there are 1700+ architects and engineers gives this whole thing a lot more weight. In addition, former Lt Colonel Bob Bowman (who was in charge of the Star Wars program under Nixon and Ford and has a PHD in Aeronautics and Nuclear Engineering) doesn't believe the official story and seemed to think Dick Cheney was at the center of it.
It will be interesting to see the role that the economic collapse plays in all of this. I would guess it would further sweep things under the rug because people will be focused squarely on their own immediate well-being (eating, shelter, etc). In that scenario, many people might blame capitalism and *not* the government's interference in the economy so they might well want *more* government. On the other hand, there will also probably be plenty of people who become far less trusting of government.