Not much. But it could get law enforcement to pay attention to the skies, and not the ground. My concern is more along the lines of terrorists mulling around in the crowd. Earlier this week on the FoxNews crawler, they were mentioning concerns of terrorists being infected with something contagious, and just walking around at an event with lots of people attending.
My other concern would be if they did have something nuclear hidden somewhere in the desert.
I contacted the BFA(Balloon Federation of America) they blew me off, I contacted the FBI, I know they are way too busy to get back to me. I also contacted my congressman, and they did not blow me off. They were very interested, and said they would follow up. They seemed to have the same concerns I did.