Almost Professional
Apologies for my error. It is true that Class D does not necessarily mean that light GA is barred, but AOPA are certainly interested enough to ask to hear of any refusals.
At my local 'international' airport, still awaiting confirmation that their Class D application will go ahead, they are "instructing" GA to go down specific routes
so as not to inconvenience the local ChavAir services.
When Mode S Phase 2/3 comes into effect a stroke of the pen would make areas of Class D a designated mandatory transponder zone. There are mutterings that the area below the 2500' limit around London may also be one such area.
If so, how do the light GA get around the area, except by being pushed into ever smaller areas of airspace and honeypots, thereby increasing the risk.
My point (badly expressed) is that it feels as though the technical solutions seem to be the only game in town, but that a radical look at airspace design would bring more benefit at lesser cost.