"This thread was started becaue I don't want any more CAS and to encourage GA pilots to cooperate with ATC"
Without wishing to be pedantic (because you may well not have meant it in precisely the way stated) this and slims post hits the nail on the head.
You say "encourage GA pilots to co-operate". We should be saying encourage GA and ATCOs to co-operate with each other.
How many times have you received when requesting a zone transit "remain outside of controlled airspace, I will come back to you". How many times have you had to remind them to "come back" and how long has it taken. As I posted before, it is a quick an as easy to say "you can expect a transit within 5 minutes".
As Slim said GA is increasingly treated as a second class citizen. It is not too surprising when GA decides if reasonable courtesy cannot be extened to their request why should they bother. They will remain outside the zone and route around as close as they can. Moreover having been left in limbo so many times is GA is also not surprisingly going to be less receptive to either the commercial guys or ATCO then being very quick to want them to alter their track. Maybe having maintained a radio watch the response should be "I will remain outside controlled airspace, I will come back to you when I am good and ready"