Since it is WORLD rally championship it need not only rallies around the World, but also drivers from outside Europe. Now there is only Hayden in works team not from Europe. Among 22 drives with points in 2017 WRC classification also only Hayden. In WRC2 is bit better situation, but still only 5 non-Europeans out of 35. Now rallies outside Europe is far from each other, so with relatively small amount of money you can do only your home rally.
APRC has Asia cup and Pacific cup, which are useless, because there participate same drivers as in all APRC, and take two titles at once, etc. If there would be Australia, NZ, one more rally from APRC zone, it could be Asia-pacific cup with R2/R3 cars with some award like there is in JWRC, also similar could be done in South America/Central America.
Also looks like NZ comeback question is alive only because Hayden. When all drivers, and manufacturers bases are in Europe is hard to expect they want to go in other continents. WRC should have all expected and unexpected possible conditions from freezing cold to extreme hot, from snow to dust to tarmac, and so on. Now it became "European" championship with few outside events. We already have ERC, with few rallies far away Europe and one who technically is in Asia. NZ being far from other countries should't be object of discuss, because Azores is one of the key events in ERC and it's also "middle of nowhere".