I'm hopeful of a second team in South East Queensland, but, in the short term, there should not be two. I wouldn't mind if it was in Brisbane or the Gold Coast, though it seems likely that if it does happen it will be on the Gold Coast.
The reason I wouldn't like to see two teams is because it would make it very difficult for both teams to be successful. They would be competing for sponsorship, players, media coverage, and, possibly, fans. It would be better to let only one team in and give that team the best possible opportunity for success. If another team was to be considered, I think that the NRL should wait until the first one had established itself on and off the field.
If there was to be a second Brisbane team, I don't think that it would be a good idea for it to be regionally based (eg North Brisbane). The Broncos have fans from all over Brisbane, and the second team would probably do it tough if they limited themselves to one particular region. If they were simply a second Brisbane team, with no regional identity, they would have a much better opportunity to build a fan base. Also, there are no other stadiums in the region which could accomodate an NRL team, so it would mean that they would have to play out of Lang Park, as the goverment would not be prepared to fund another stadium.