Indiana? No way man, they love their basketball in that state. Despite the state of the team right now, they've had some really good Pacer teams. The Pacers were an important team in the 90's, when basketball was at it's best. I'd probably get rid of the Grizzlies too, I don't think they're a big draw... I dunno, I'd have to do a total review, but definitely the Timberwolves (Yeah, they have really s***** attendance since the end of their playoff teams, and even worse since Garnett left) and Raptors.
The league needs to be smaller, so the talent doesn't spread itself so thin, and there can be a lot of teams that can play with the best teams. Like I said before, the Bulls always got a fight from several teams. It was never an easy ride for them, despite the fact that they won 72 games in the 95-96 season. They always got a good fight from the Pacers, Knicks, Pistons, or whoever they played in the finals.
Now, it's just 4 or 5 teams that are always vastly superior than the rest.