The NRL would be looking to grow crowds and memberships and using the draw as a tool to do so now the FTA money is locked in.
Rather than just randomly schedule games and hope it turns out, perhaps consult with the clubs about owning a timeslot for the season and playing a home game every 2 weeks (exactly). For example:
*Cowboys own the Saturday 7.30pm timeslot due to fans in the region having to drive long distances to attend and the daytime heat
*Brisbane on Fridays at 7.30pm, because they can still pull good crowds at this time and we are all expecting it to be this way anyhow
*Canberra on Saturdays at 3pm, they're not popular enough to own a Sunday arvo timeslot and a daytime spot should attract more local fans due to cold
Obviously these are home games held every fortnight so it is possible to two teams to own the same timeslot in alternate weeks. If you had two teams that share a venue (e.g. Dogs/Souths), you could have them share the same timeslot so every week on Sundays @ 4pm there is a game at ANZ.
There are certain teams that rate better than others, hence why the Broncos are always on Fridays on FTA. These specific teams should be given priority for FTA spots. Teams in non-FTA timeslots will get more away game matches against these teams which are shown on FTA to balance it out. FTA teams will not play each other more than once. Remember some teams play each other twice, some only once.
The reason for doing it this way is to build a habit for casual fans who don't go that often so that every 2 weeks at the same time there is a game at their team's home ground. Try it for one season and see how it effects crowds & memberships.