Awesome job John and Bruce! I lean to your take Bruce... and ironically, it's because of a factor that the more optimistic John pointed out.
Unless you've been in that stadium on game day, you really can't appreciate the intensity level that fanbase brings. Going to a home game at Fed Ex is like visiting on Bingo Night at the Seniors Home by comparision. Part of it is that incredibly compact and vertical stadium, part of it the weather (all those clouds keep the noise right where it is), and a lot of it is the '12th man' mentality.
DC will never, ever have that kind of intensity I'm sorry to say. Washington is a transitional, always morphing city and always will be. There's probably more populace turnover in the DC-MD-Nova area than in any other major city due to the nature of being the Nation's Capital. That results in half of every Fed Ex Field crowd being opposing fans, casual fans, or wine and cheesers. Just the way it is.
But Seattle? Those fans are sick and they're mean. It's going to be loud, inhospitable, and ugly. We aren't ready for it imho.
And finally, Bruce, so agree on the Seahawks uni's and colors. Hate that team but love their look. And I don't care if Pete Carroll is a nice guy. On game days, he's a whiny child - he can suck it