No. I think you can safely assume that there will be no pass rush this season. What have they done to address this CLEAR issue in the off season? Um....nothing. Now we have no Warren for the year. Yes, it has gotten worse - who thought that would be possible!
So, no pass rush, no proven secondary, a saftey tandem that have a better chance of seeing God than covering a TE with any consistent success. Oh, and a suspect run game - meaning if the Pats score, it will probably be quick giving the defense less rest. Friggin' terrific.
I blame BB and company. Serioulsy - the biggest concern last season was lack of pass rush and they did NOTHING to fix it.
Well, of course we can "safely" assume anything. No one's going to die if we're wrong. But that being said, there are several things I contest with what you said:
1) Warren added very little to the pass rush last year. In year's past he was better, but he was hurt. His loss affects the run D far more than the pass D.
2) We have the following players who should improve from year 1 to year 2: Butler, which will help to cancel out the loss of Bodden (not completely, but it will help), Chung, who had 2 sacks last year as a part time rookie safety, I expect big things from him. Brace, who's showing he has the potential to shore up the run defense, and possibly contribute to the pass rush. Vollmer, who will help the run game.
3) We have a rookie in Spikes who has already shown he can be solid against the run, AND put some pressure on Bradford from the middle (penalty negating it). People don't like to see things sometimes, but the pressure on Bradford wasn't too bad, it was the secondary's inability to cover the quick hits.
4) Mayo is healthier. Again, pass rush comes from more places than just the DE and OLB. Pressure from the middle can be more effective in many cases.
5) Scheme. BB is taking over the defense, and I'm willing to give him the benefit of the doubt before I say there's no way he can improve.
I didn't even include Cunnigham because we haven't see him, but he's another wildcard.
So, in short, nothing is guaranteed, but to say they did nothing and it's a foregone conclusion that the pass rush won't improve, is pessimism to an extreme degree.