That will never happen, the numbers don't add up , far more FTA viewers than pay so the NRL would always sign a multi level broadcast agreement.
Streaming is probably the way of the future, so it will be interesting to see how this develops.
Already I can stream all games free to my Telstra run mobile phone and IPad, and with Telstra NBN at home I can stream all games to my Telstra TV.
I however have Foxtel Sat, as I can take a box with me when I travel and watch games anywhere ( and places where there's def no internet ), so it will probably continue to be a mixture for some time.
Plus the Foxtel HD telecast is the ducks nuts, far far better than streaming but I imagine as that progresses you'll get the same quality ( as I already stream Netflix in HD).