I can understand the QRL's pushback for a National Reserve Grade, especially based upon the current makeup of the NRL competition.
If a National Reserve Grade kicked off tomorrow, the only NSW Cup teams truely impacted would be the Newtown Jets and North Sydney Bears. Sure Wests Magpies would need to be renamed Wests Tigers again, and Manly would drop their affiliation with Blacktown Workers, but that's it.
Mounties, Wentworthville, etc have all left the competition.
Compare this with Queensland, who have done a great job creating a truly statewide competition. None of their 15 teams will be represented, and will be replaced by just 4 clubs.
Personally, I'm not a fan of development pyramids being built like skyscrapers, and all the research into proper high performance structures support that. This is why the NSWRL and QRL were both encouraged to expand out to 16 teams each, and why the Junior Representative program was expanded significantly.