The NFL, and other American leagues, starting to take international growth seriously should scare the shit out of most of the major sporting leagues in the world.
Their cultural relevance, resources, and appeal to younger demographics, is a potent mix, and if they're genuine about some of the larger markets globally, and play their cards right, they could really shake the whole industry up on a global scale.
All they'd have to do to completely screw the traditional Australian/Trans-Tasman/South Pacific sports industry would be to actively pursue talent in the market, and within a generation it would become an uphill battle for local leagues to keep the best of the best athletic talent in the country.