First off, I think that Occupy Seattle was destroyed by a bunch of ideologues from the Bay Area who wanted to take over and run the show. They deployed, among other things, the sort of Critical Theory arguments that educated elites are unfortunately susceptible to, and guilt tripped them into going along with whatever came down the pipe.
Now, I've just come back from a trip to the Midwest, and, while I can't say that it was comprehensive in the sense of visiting every state and every metro area there, I do have to say that Seattle most definitely has much more going on culturally, politically, and socially than vast areas in the middle of the country. This includes many areas in the more politically progressive Upper Midwest around the Great Lakes.
Occupy Minneapolis and Occupy Madison were likely pretty major, but what about Occupy Cleveland, or Occupy Indianapolis? There are many places around the country that would give quite a lot to have what we have in Seattle, and the folks who chose their own limited goals and ideologies as opposed to honoring the spirit of "We are the 99%", that was intended to be a big tent movement and not a sectarian one, fucked it up. They, and we, had the perfect opportunity to build something enduring in Seattle area progressive politics and it was burned to the ground.