That might be easier said than done, though, because there may not be enough space to do that. If you have the airspace packed at 2nm and then you need to rever

That might be easier said than done, though, because there may not be enough space to do that. If you have the airspace packed at 2nm and then you need to revert to 5nm, all the planes will fill 2.5x as much area. Plus, how would ATC safely effect that separation when the planes are closer than resolution of the equipment.