When it was first rumoured, it was obvious what would happen. The 'old school' RX circuits were out, and the 'shiny new' F1 tracks would be the venues of choice for IMG. Sod the old fans of the sport - they want the new fans, who drink RedBull, Monster, etc and follow the sport in the modern way.
I'm not sure WorldRX is yet big enough for all these sudden changes...but, those in charge think they know best - but quite often it all come crashing down after a few successful years. As there's no support structure in place.