The Blaine Bus Tour has not been totally scrapped; however, it has been indefinitely postponed. It's also unlikely that David's next stunt will proceed given the circumstances of 9/11 and the general mood and "changed atmosphere" in NYC. Everyone's focus has for now shifted and death-defying stunts in this "context" are likely to be considered distasteful, trivial, and irrelevant. Even films such as "Collateral Damage" have been postponed or dumped.
Obvious Note: Depending on how the "war" plays out (if it plays out) will determine how "magic" proceeds, succeeds, and evolves in the real-world.