He had one of the most dominant seasons ever by a defensive player (both statistically & effectively). There's almost no doubt he won't reproduce those stats, so a regression in that sense is almost inevitable. What's important, though, is he'll be the focal point for offenses to stop, so others need to take advantage.
I think he'll end up in the 14-16 sack range... Which is all good, as long as Smith, Merci & Reed pick up the slack.