Hey guys/girls just wanted to post to give you an American view on this.
Stumbled accross SoO on TV in the US about 5 years ago and have been following the NRL closely for 3.5 to 4 years(big fan). Hayne trying out for the NFL if handled/marketed properly could be a boon for the league in terms of growing popularity in the US(viewership/participation).
The NRL is actually on normal cable here, FoxSports2, so it's possible for Joe American to watch the games. The problem is 0 advertising and the games are on midnight to 6am so very few people even know about it.
The NRL should also start actively recruiting former NCAA football players.
Of all the sports I've watched through the years which includes BPL, Serie A, UEFA champions league, AFL, Aviva Premiership, PRO 12, Heineken Cup, LV Cup, cricket etc.. Rugby League has by far the highest entertainment value.
The fundamentals of the sport are also very close to American Football so it's relatively easy sport to follow if you understand football.