would GA pay a navigation service charge
Ahh a can of worms, I can already hear contributors from all camps crying what about tax on fuel, the inadequate funding of LARS etc?
I wonder whether the Controller at an airport with only an ATZ around it who's trying to dodge the unknowns, is working any harder than the sole controller managing a shed-load of IFR recoveries in a Class D Zone... difference is I guess the unknowns can continue on their way unhindered around the former... but are perhaps unaware of the mayhem they might have left in their wake?
Environmental Lobby... I presume you mean they object to the establishment of CAS as a means of stopping expansion? We aren't talking about CAS here (or more properly "regulated" airspace, nor am I suggesting the rules for it's establishment need change, just that there might be way to offer a tadge more protection to smaller airports who do not have the protection by having various sizes of ATZ?