There are some very good markets out there that don't have NBA teams. What are they going to do? Just play musical chairs with the teams they have, and leave a trail of unhappy cities behind? Thats lousy marketing anyway you look at it. My old hometown of St. Louis was a great basketball town, and a town that has no problem getting city money to build new baseball and football stadiums. They would love to get another NBA team, since the team they supported left, not because of bad attendance, but because the owner saw bigger dollars in Atlanta. kansas city already has a new arena, and wants a team. There are other major cities that at some point might want a team. Cincinnati, one of the original homes for the Kings springs to mind.
At some point the league is going to have to address this, and the best way is through expansion. The players association would readily endorse it, because it means more jobs for NBA players. The league gets richer because of the expansion fee of a team, which I think is around 300 mil, or was. But before you go to expansion, you have to get all your ducks in a row. Sacramento is part of that. Just my opinion..