I count about 12. Not exactly awe inspiring. And how many understand how buildings fall? We are nearly 7 years post 911. By far the majority of structural professionals haven't signed. To me that's more of a red flag than this list.
Hey, I don't wish to trample on your dreams here. If you wish to embrace this sort of flakiness as compelling evidence, then that is your choice to do so. For me, it falls very short. The numbers are dismal considering the amount of general engineering/architecture professionals they've opened it up to and could potentially sign the petition. Students don't really count for much as they are impressionable, naive, and don't know much about how things work in the actual application. This is why engineers engage in field training and doctors clinical.
As far as what forum I read: I think I'll post where my interests take me. Thanks for the concern though.