It is a week-to-week league. No question. Parity, that has increasingly become more prevalent since the current free agency/salary cap since was adopted in 1994, is maintaining relative competitive balance league wide.
However, parity is only advantageous during the regular season and only when proper coaching and player execution excels over that of a given opponent each week. So, it becomes a definitive week-to-week question at this point of the regular season. How will Dallas fare:
Week 16 at Miami?
Week 17 at home versus Detroit?
Week 18 at Washington?
These questions cannot be set aside because they shall offer clues for how the team will do afterwards, when there is no longer the promise of a next game the following week, regardless whether the team WINS or LOSES the games above.
How a team wins or loses during the regular season matters. The law of averages catches up with every team, except one, each season. How shall the team prepare to make certain Weeks 19 through (fingers crossed) 22 of the NFL schedule is not a fatal relapse of:
Week 3? Pathetic.
Week 5? Pathetic.
Week 8? Encouraging and confidence building.
Week 14? Pathetic.
Fans (at least some fans) will grow more confident if the team demonstrates they are IN every game down-the-stretch. They will 'know' the team is reasonably capable of going on a run.
Show some blasted grit. Dominate. Beat the final teams by 30. Beat them in 1-point nailbiters. Lose by a touchdown in a knockdown, drag out fashion (but without the shooting yourself in the foot late like at Philadelphia). Play championship quality football these last final three weeks win or lose. Take advantage of parity. Do not let parity take advantage of you. Give yourself a fighting chance to win it all.
/rant