There is no issue with CAS as such. The issue is that once the airport managers, with their fresh MBAs, see ££££ in the form of nice clean jets paying them a few hundred £ a pop, they are quite likely to want to push out "dirty scruffy" GA.
That's what happened at Aberdeen, where GA is only just hanging on, and many other places around Europe.
Once landing fees hit the £50 mark, the traffic will fall to nearly zero (just a bit of high end IFR traffic) and then you usually see a collapse into Signature-style £200 mandatory handling.