BBMF does a fair number of non air show events and probably not as dependent as the Reds.
As well as air show cancellations and the expense of maintaining warbirds, there is a whole industry out there with professional display teams and the industry support.
One event that could lose it display element it Battle Proms. Each event has one display by one Spitfire. The audience is necessarily small compared with an air show so the per capita increase could be huge. As the air element is a minor aspect the obvious thing is to cancel it. That would then put another war bird at risk.