It might be an unpopular opinion, but here's my thoughts:

As World Championship, World RX needs to expand to other continent, to promote and popularize RX all over the world. The problem is if the new host are build the new purpose-built RX track, the future use would be questionable, so converting already existing race circuit into RX track is the most viable choice. It might hurt some of the fans in Europe, but that's what it is.

I'm happy about Abu Dhabi because they would finally come to Asia, but still need to explore other areas like Japan (Suzuka RX track, anyone?)