An article in WIRED magazine (http://www.wired.com/magazine/2011/08/st_flybywire/) describes technology used in Sweden that can provide a 360 degree hid-def screen view of aircraft and detailed data around a control tower. The benefit is that a air traffic controller can be located at a remote location and guide traffic into the airport. The technology permits many different airports with low traffic to share a controller, albeit at a distance.  How many other tasks can be similarly outsourced to distant locations if the data fidelity and quality can be improved ? Would these technologies only be relevant for small airports or could there be an oversight role across large airports for which such technology would be relevant to prevent catastrophic events ?