I saw last week when I registered for the Seattle Danskin (I was wait listed, oops, missed the registration) that the Trek was moved to September 20 - would have been right around the same time as the USWTS. Maybe they knew that back in April when they decided to cancel?

My guess was that Trek either didn't have enough signed up or couldn't prep in time for July... but regardless it sucks that they think Seattle can't support 2 races in the same month.