Regarding the amount of rounds - I don't imagine that the TV broadcasters are going t want LESS games per year. Atleast not significantly so.
Why not 18 teams - two conferences (H/A) verse your own conference for a shield and once against the opposition conference teams. Winning the conference shield could become massive especially for Sydney teams which could have a defacto Sydney Premiership.
I follow a non-Sydney team and would not for a second be grudge the Sydney Teams playing for a Sydney Cup with National / NZ sides playing for a National Cup (with the advantages that may give Sydney teams in terms of travel)
it's not that many less games
180 games under this proposal versus 192 currently, after adding in finals and SOO the difference would be around 5%, mostly made up from increased internationals, NRL 9s and U20 events like SOO, junior Kiwis vs kangaroos etc.
e.g. instead of $1.5 billion we'd get $1.4 billion.
that's why the NRL is considering increasing the lengths of games (not that i think it will happen), because they want a fan friendly TV deal next time with more day games and control plus slightly less games means they may battle to substantially increase the deal from $1.25 bil to say $1.5. And then add in general downward trend in TV ratings across australia.