25,000 supporters (basically the NRC TV audience) paying $50/month would get the ARU $15m, about half what the current broadcast deal is worth each year.
All sorts of issues with those numbers, but definitely worth investigating...
It would require a combined effort on behalf of all the Unions involved in Super Rugby as a means of providing enough content create the necessary value to realistically ask those sort of prices.
But it could be possible. Certainly worth it if you can gain access to;
Super Rugby
NRC, ITM Cup and Currie Cup
Vodacom Cup, Vodacom Cup and Shute Shield/Brisbane Comp (both)
Varsity Cup, First XV Rugby (NZ) and say a Schoolboys Cup here.
Schoolboy Rep games, U20s Rep games.
Some sort of 7s Circuit. NZ 7s Championship.
Top League, Pacific Nations Cup, Campenato de Argentino de Rugby, the Argentine Club Championship.
Highlight and variety shows, competitions I'm not even considering. There's potential for thousands of hours of Rugby entertainment.