While live streaming is a very nice idea I think it's something that will come in time as the competition grows. As mentioned keeping costs down is essential. When you're looking at where every cent goes $5k per game adds up pretty quickly.
It's maybe something for the future but it's good that rugby TV are pushing it. Maybe they'll get funded by a local benefactor to do the odd one on a trial basis at some point.
What I think would be really good for such a new competition would be if someone re-cut footage from the highlights packages into a number of bite sized videos that could be more easily shared via social media.
This could include a select team of the round, top tries, top plays etc. with the editing kept tight to reduce any dead air and aim to keep the videos around the 1 minute mark.
In addition I think a short video on each of the teams showing a game day from various fans views along the lines of the USA soccer "I believe that we will win" would also be great to see. Doesn't have to be an exact copy just show a cross section of some of the fans interspersed with some game footage. Again keep the length down to encourage sharing.
I like the highlight videos that Brumbie Jack posted and something of similar length that gave a flavour of each round would be excellent. New people are going to want to dip their toe in first before taking the plunge and watching full games.
I think for now fan made promotion might be the smartest way to get the word out about the NRC. It's cheap and someone with passion and the time to dedicate to it can really have an impact.