This is one of the best articles written about the arena situations. It talks about the possibility of a move to the burbs and the options. More importantly, it talks about what would happen to Key Arena without the Sonics.
The Seattle Times: Sonics: Sonics' move to the 'burbs: Would it be a bust or a boon?: "Eastside business leaders say a privately funded arena in Bellevue could work, at least in theory.
The facility would have to keep busy with trade shows, concerts and other sports teams besides the Sonics and the WNBA's Seattle Storm, said Kemper Freeman, the owner of Bellevue Square and Lincoln Square. And it would need to offer lots of parking and good vehicle access, both of which are hard to find at KeyArena and other local sports facilities, he said."