I thought there were some articles that came out last year indicating that Seattle was submitting a package to host although I never saw anything after those articles. Average temp requirements are 50 degrees for outdoor stadiums, we'd have to get a waiver for that. The CLink holds 67k right now, minimum is 70k. We'd have to add seats (already have the ability in the south end, not sure how many). Need 25k hotel rooms in the immediate vicinity. We have that, but it depends on what is considered "immediate vicinity". I'm sure having Boeing Field right close to the Stadium is a pretty big deal for all the big wigs as well.
That said, the NFL indicated that 125k people came in to Dallas to partake in the Super Bowl events in 2011. That just doesn't bode well to win a bid when our stadium can accommodate the minimum requirements and requires approval of a waiver for the weather.
Getting a winning bid is much bigger than what the Seahawks themselves want though. Knowing the political climate here, it's going to be difficult to get them on board with additional funding necessary to make improvements to put us above the other competing cities.