I think they gave it a waiver back in 2009; with only Citroen & Ford.......after Suzuki & Subaru pulled the plug late 2008. Strictly speaking, anything less than the 4 makers, or 3 continents, and the WRC becomes World Rally Cup/Series. However, that would be lessening their own championship - not the brightest thing to do. So, they've ignored the sporting code.