NFLX is a portal to other cultures. Just as a huge variety of independent films are available from all over the world to us. Our movies and videos are available to the rest of the world. That's really the whole point of subscribing to NFLX. That's why once a subscriber sees the variety available, he/she will not give up their subscription.
The growth comes from that principle. Anyone with a Internet connection globally will find it hard not to subscribe once exposed to it. So that's what the growth potential is.