It is interesting that Pitkin County believes that it has jurisdiction over airspace and intends to try to regulate aerial filming. The National Airspace System is regulated solely by the Federal Aviation Administration. The county has zero regulatory authority over any part of the National Airspace System. I'm sure county attorney John Ely will quickly discover this fact as he consults with the FAA on the issue.
Regarding the use of unmanned aerial vehicles, in February, Congress passed the FAA Modernization and Reform Act of 2012, which requires the FAA to create a regulatory framework for unmanned aerial vehicles by 2015. The FAA is currently in process with this mandate, with its foremost goal being aviation safety for all manned and unmanned aircraft.
Pitkin County should understand that its jurisdiction ends at ground level and leave the airspace regulations to the pros at the FAA.