I am sure the Olympic 2012 stuff will use armed military helicopters, mostly.
The majority of piston GA flies too slowly for a jet to intercept formally (except to shoot it down at a distance and it would be a massive own-goal to shoot down a non-terrorist target).
I also don't get the ban on solo x/c flights. Sure the students sometimes get lost, but PPLs also get lost frequently. And you can't shoot down somebody who is just lost.