Just remember since 2011 this team has finished no worst than 5-3 in the 2nd half of the season.
2011: started 2-6, ended 5-3, 3 losses by 11 points
2012: started 4-4, ended 7-1, 1 loss by 4 points.
2013: started 7-1, ended 6-2, 2 losses by 9 points
2014: started 5-3, ended 7-1, 1 loss by 4 points
Health-wise, with the Seahawks playing what 1 game in the last 23-24 days, they've got two much needed breaks with 10 days before the Cowboys game, and 14 days before quite possibly their biggest match-up of this season, right now. They got a chance to recuperate and revitalize, prepare their mind and bodies for the 2nd half gauntlet. All the guys who were banged up and hurting are going to be healthier, and all the guys who were healthy are going to be fresher. I think the break is going to be huge for Russell Wilson the most, he's kind of taking a lot of damage, and I think it will help him refocus. Some of the guys who kind of been playing banged up or not 100% like Gilliam and Hill, I think the break(s) is going to help them get back on track 90%-100% physically.
Schedule-wise, its no picnic, a lot of tough games in the last 8, maybe only 2 gimmes vs the 49ers and Browns. But after a rough start to the schedule this season, and the much needed mini-vacations, the Seahawks are going to play 3 home games in a row, and home-cooking has always been good for this team, the 12s are going to be riled up for SNF against the Cards, and if any momentum is to be gained, it would be in the next 3 games, If the Seahawks win those next 3, and start clicking together and start rolling, and as we've seen in the past its going to be hard to stop their primal avalanche once they get going and start imposing their havoc at will.
8-0 is far fetched but not entirely out of the question, its obtainable. 7-1 seems more plausible. And 6-2 seems like it would be the worst the team can do. Seahawks aren't horrible, they've played better than their record, they've just needed to clean up a few things coaching wise, execution wise, gain some needed experience and familiarity, and just galvanize as a whole, if one unit can't finish, then the others have to find a way.