Whoever governs the sports, there must be stability in the regulation, and that's what's really lacking in the current WRC. Manufacturers are not there for fun but their involvement in WRC must be a good investment for them in the form of promotion, technical development, etc., but with regulation changing faster than you can adjust to, the manufacturers cannot really invest in WRC these days. And the problem with FIA is that manufacturers don't have much say about the changes. I think FIA should need to stop changing regulations and open the door to manufacturers so the WRC can be good place to invest.
I'd suggest FIA and manufacturers review the regulation every 3 to 5 years to make adjustment as requested from both sides and stick with the same regulations (including calender) for that period of time.