Understand your concern from the Seattle game, but it is one game. I trust BB and co. will figure it out.
But why will we have massive roster turnover next season? Have you seen our cap situation next year? We have a ridiculous amount of cap space and only a handful of guys that are must re-signs (Hightower, Butler, Bennett).
The one thing that I think can bite the Pats in the ass is the lack of leveraging first round picks (1. we had last year's stolen and 2. we got rid of Easley/Chandler). Look around the league: if you don't hit on your first round picks, it puts you in a very tough position both from a talent and cap perspective (first round picks having the 5th year option).
Regardless, we'll always be in contention with BB/Brady at the helm.