Fascinating subject and a long way from the 'safety comes first mantra'!
Can't help but agree with M. Some eminently sensible ideas. However one of the problems which it raises is that the majority of the GA fraternity [glider, parachutists, hang gliders, microlights etc etc etc] have traditionally been opposed to controlled airspace of any kind. The military have also opposed any hint of increased controlled airspace even when intended to protect the interests of commercial air transport and airports. The above groups want freedom to do as they please, a minimum of licensing requirements, a minimum of nav equipment in their aircraft and a minimum requirement to converse with ATC!
Anyone who has attended the CAA's Air Traffic Services Regulatory Advisory Committee [ATSRAC] will have heard the protestations voiced by the above communities at the slightest hint of more controlled airspace.....and as they have, or at least used to have, far more seats around the table than the airlines and airports they make life pretty difficult!
Discuss!!
H49