nawfside, I think they'd only need two more teams (giving 32 teams) which would even things out actually (4 leagues, 8 teams).
nevertheless,
take a look at the film in this link - pay close attention to the end of the film (not one sonic fan showed up). So much for the 'rampant sports history and support of Seattle'.
Sonics Going To Oklahoma City In Settlement - Sports News Story - KIRO Seattle