Raptors because of Canada's high taxes. High profile athletes don't want to play there because of the taxes and cold weather. Plus the team has no history of success, so they'll always be a door mat in the league because a history of not winning will not draw good players through Free Agency. But I doubt Stern will contract them because he's trying to globalize the NBA, and expanding into Canada was just a start.
The Clippers should move to San Diego, but it's better they stay in LA because of the fans who can't get Laker tickets will bite the bullet and buy Clipper tickets just for the experience. So it's that trickle down effect. Staying in LA, at least they have a built in fanbase and won't have to worry about the expenses of moving a franchise and trying to sell the tickets to a new market. At least not in these economic times
The other team they should contract is the Hornets. Once Chris Paul leaves, they'll have nothing and the fans will not have an interest any more. The only reason why NO even has a franchise is because they tested that market by putting a few games there and the public responded. So yeah, it looks good to sell out an arena when you don't have a team there in the first place. But once you put a team there that had some success early and then it starts to fall apart over time, players not living up to expectation, a coaching carousel, and the superstars starts bitching and hinting at leaving, how long will it take before it can be rebuilt before the fans lose interest?