I see Smith as a complete non-factor this year. He's still recuperating and he's a project, based on an educated gamble.
I think the bolstering of the DT positions will be the main thing to offset the loss of Doom. Phillips can contibute. Not sure how much he has left in the tank. I'm expecting a slight drop in pass pressure and sacks.
Hopefully, the improvements to the offense can make up for that.