I actually think the Nets are more likely to be a good thing for the NBA because they have no incentive to tank.
Sure they're bad this year, but they'll make every effort to add anybody they can. Finally at least one team will at least try to improve towards mediocrity. Someone posted the other day how they could trot out a starting lineup of Brandon Jennings, Courtney Lee, Demar Derozan, Thad Young, and Brook Lopez next year. They'll never be Philly bad.
And I don't believe the NBA really cares that much about one of their major market teams being bad through mismanagement. If they did, they would have pushed Donald Sterling out in LA decades ago.
A team not having draft picks is not the death sentence some think it is, especially from a league-wide perspective. There are a lot of things worse then a team that most likely will be filled with at least some mid-level NBA talent next year.
Teams actively trying to be as bad as possible is bad for the NBA as a whole, that's not Brooklyn.