I've been a Seahawk fan since team inception. Like the OP mentioned, it's hard to get too up for a Seahawks season, because it seems like inevitably, my beloved Hawks let me down the more I expect from them. It's not like we've stunk forever like some franchises. We'll get up, then crash down. Hell, recently, I was really on the verge of not caring too much, and trying to become a more casual fan at the end of the Ruskell era. Then we hire PC and he grabs JS, we start the roster churn and turn out the most entertaining 7-9 in the history of the league.
I've never had expectations of a Superbowl before the season. Even in 2005, I figured we were a playoff lock, but still wasn't sold on a SB berth before the season. This year, I expect SB. It's scary in a way, because there is so much farther to fall. We are such a scary deep team, with great skill position players, a crushing defense, a FO and coaching staff that is never complacent; we're solid, we're creative on offense and defense....and we're YOUNG. All these guys can even get better, that's what's scary.
The league knows it too. We're the consensus pick. The other players sense it happening, and a culture is being created. FA's are coming here on the cheap; knowing they have to compete for a job and that they're not going to be the highest paid guy in the league at their spot. Guys are willing to play for value contracts to get a ring......we're the Patriots of the West now. Hell, we might even be the new Patriots.
Writing all that, I'm full circle and with the OP. I really don't know how "all in" to go. Bet your ass if I get to a game this year, I'm All In screaming my lungs out though.