I'm not a reliable prognosticator, but here goes:
1. 9/11 "truth"erism was a peculiarly deranged byproduct of disdain for George W. Bush, and will, with the election of President Obama, wither away to nothing within 2 years.
2. If the economy really tanks (hard landing and not soft), we will see from the right re-runs of the old conspiracy theories about Clinton, except applied to Obama. And, unfortunately, these will gain much more traction than those against the 42nd President.