Personally, I hated the year 2015. From the SB til week 6, there was a decade's worth of heartbreak for Seahawks fans. Really all season long there were only two wins I'll cherish, Pittsburgh and Arizona. From Chancellor's holdout to the injuries to the shocking ineffectiveness of our pass D to Seattle finding ways to lose games in new and exciting ways, it was a year full of pain that I hope to never see ever again as long as Pete and Russ are here.
That said, 2015 was also a turning point season where Seattle became more feared for their offense than their defense. Russell has emerged as one of the very best pocket passers in the NFL, and Thomas Rawls looks like he could give Seattle a Jamaal Charles career path. I'm very excited for the return of Graham and Richardson as they seem tailor made to fit this new spread heavy style of offense.
My only doubts about Seattle's future are related to the pass defense. It seems like the league has solved Pete's cover 3. Seattle's pass rush seemed like it needed to blitz to get home all year, so that might be something to look at as well.
I think the goal for Seattle should be to get home games next playoffs and then hope for three straight non-weird games in the postseason. If that happens, Seattle can be champs again. I will never trust them to win 4 straight on the road if only because something as seemingly innocent as sodding a field a week before the game could make it a weird game for Seattle, and they'd have no control over that as a visitor.