Depends how its done. If it is earned, possibly. But NZ fans are fickle, as soon as their teams aren't successful they'll go back to rugby just like they've always done. Instead of a 2nd team I think the Gold Coast Titans should embrace the massive Kiwi community that flock there. Set up base on the South Island and move players from there. I think if the NRL plan to continue expanding without a plan, it's not a good idea for any team to be winning games with a view to bring in a 2nd team. The game has never really expanded past the East Coast of Australia and Auckland. If they can show an actual plan, other than a premiership bringing excitement to Kiwi fans, then maybe it would be a good idea. Unfortunately that isn't what this NRL leadership team does.
Teams should set up bases with the intent to grow the game, with help from the NRL (which won't happen).
Gold Coast-South Island
Brisbane- Ipswich, Toowoomba and Logan
Perth- South Africa
Dolphins-Central Queensland
Melbourne- Victoria and Southern NSW