Peel were assured that there would be developed, transport infrastructure such as rail and decent highway access to the airport. That has not happened and as far as I can tell, is not likely to. Hence the reluctance of operators to increase frequency and routes. Without the transport infrastructure, there's no chance of making a decent return. I presume the CAS issue was started some time ago in preparation. It would seem excessive given the current status of the white elephant.
Having said that - I regularly transit through their airspace pretty much without any problem inconvenience and often through the overhead. I think a lot of people object simply because it restricts their propensity to bumble about the place trying to avoid anything that might require some degree of planning and forethought. The only thing I find annoying about dealing with them is the distinctive 'squeal' of their remote RT equipment.
Best Wishes