Check out the Hawks vs Cats AFL crowd. NRL crowds really are shite.
Having watched both Wallabies/Lions and Cats/Hawks with 85000 each and seeing how much atmosphere contributes to making sport entertaining.
For casual or neutral fans watching at home and seeing a packed MCG and ANZ and then seeing 8000 in Darwin, if they have no strong allegiance one way or another something like atmosphere could be the thing that swings them towards another code and gets them enjoying that more.
More needs to be done to improve crowds. For a while now I've been calling for standalone origin weekends and for the NRL to get each club to offer memberships that include tickets to away games. Also automatically moving any sell out in a suburban stadium to one of the major stadiums.
I guarantee NRL average crowds would go past 20,000 in the first year.