Well, Brady had his worst season in a while last year stat wise. His qb rating has been in a steady decline since 2010. But he is still miles ahead of what we've got (or Buffalo)
I don't know what to expect out of NE this year. They may well be in the Super Bowl again. They have a renewed focus on defense, but they're very "win now" when it comes to the ages of guys like Wilfork, Mankins, and Connolly. And who know what Revis is planning after this season. But I don't think in the NFL you can predict 3 years down the road. Except for Buffalo, I have no faith in anything they do.
The QB rating thing is tricky...the first year of that four-year period (36 TD and 4 INT) was based on good fortune...he WAS good that year, but he could've had 8-10 picks easily...opposing DBs dropped some easy INTs. Last season, he and his receivers clearly weren't on the same page. His QB rating was also a LOT higher with Gronk in the lineup. But a guy in a late-30s can't be considered a lock to continue to perform...I don't care who he is.
And yes, they are in full win-now mode. That was shown conclusively when they brought in Revis.