We've lost around 50 goals (Green, Fehr, Ward). Williams can score 20. That would leave 30 or so to make up if we want to maintain our offensive output. The young players may improve, the addition of another 10 goals if we're lucky say. So, we're short another 20, and that assumes that Ovie, Backstrom, and MoJo all stay on par. In order to improve our goal scoring output, we need a couple of players probably who can get 30 goals between them given that there is no player we could aquire who is a 30 goal scorer at this point.
Estimating
OV - 50
MoJo = 18
Williams - 23
Backstrom - 20
Bura - 14
Kuznetsov - 16
Laich - 10
Chimera - 6
Brouwer - 20
Wilson - 5
Beagle - 5
Latta - 3
Galiev -4