Hockey will be great in Seattle.
A while back there was an article in the Seattle Times talking about the viability of Seattle as a hockey hotbed
http://seattletimes.com/html/hockey/...keytown16.html
I like the round glass arena in the concepts. The square one looks boring compared to Century Link and Safeco Field.
As for the people asking about the drive to Vancouver, it's usually 2.5 - 3 hours (I do it all the time). If waiting times are your concern, there are four border crossings in the lower mainland to choose from (Peace Arch, Blaine Truck Crossing, Lynden, & Sumas). Nexus Pass makes the wait pretty short (In June they made some changes to the Nexus pass and made it a bit easier to get). On holidays and peak travel season the wait at the border can be longer but for people coming down to see a game on the regular it wouldn't really be a problem.
Also if people don't want to drive, you can take the train or a Wi-Fi enabled bus from downtown Vancouver to downtown Seattle.