The only thing I can see that has any benefit to NWI in the last 4 years has been the opening of Saxon allowing charters to avoid the work shy jobs worths in the main terminal.
The ground infrastructure ie taxi ways etc are a disgrace and when I taxied up the caravan road taxiway I am sure thats where we picked a ding in a prop that an engineer had to spend 2 hours filing out and led two weeks later to getting the prop rebalanced.
I really can't see getting CAS is going to help you at all getting more CAT in. You have your route to AMS your Aberdeen flights are all linked to the oil. Yes the holiday charter market might increase but I doud't it unless the local population start breeding like rabbits. Where else and who else would want to get to NWI.
Anyway best of luck to the GA pilots in the area unfortuantely I suspect after the Doncaster successful bid they might actually get it however unjust that would be.