Is it just SRG?
The CAA is made up of SRG DAP CPG and ERG so Economic Regulation would seem a more likely driver for change.
The impact of removing cross subsidies will be something those organisation who (maybe unwittingly) have benefitted.
The answer is for a concerted lobby to seek some form of payback to offset the increased costs. If these materialise then perhaps the various groupings should amalgamate to press for a reduction of regulatory burden that would lead to reduced costs.
Can't think of anything at present but there must be some resiprocity,
Sir George Cayley