So I did some reading on the history of incorporation of the district. Apparently Seattle decided to not incorporate it because it would cost too much to add social services. Instead they encouraged the nearest suburb to try to incorporate them. The suburb has a history of just not expanding social services. In 2012 the suburb was able to get some of the district to vote to incorporate, but they have been unsuccessful in convincing the rest of the district. Turns out it is a very complicated situation.