After the accident any council and potential sponsor might be alot harder to convince,
The "Elephant in the room" is that the promoters of the airshow want to offer excitement, and the pilots want to be seen to fulfill their role in this expectation. But too much excitement, and it all goes the wrong way. No one, particularly promoters and organizers like to admit the possibility of, nor discuss accidents, and I have never seen the word "safe" as an element of promoting an airshow, but perhaps it's time.
What happened at Shoreham is well known, so it should not be a stretch to discuss in the council/promoter meetings for airshow preparation. Perhaps a discussion which has the theme: "Let's dial it back a little, display the aircraft, but build in an extra layer of safety for everyone, no corner of the envelope stuff." Hopefully this would make the job of the Show Boss much less stressful, and the CAA's oversight role easier...