Wagner for rest of this season is a loss based on the crap they are playing on the 4th line now, but I don't think he's a loss beyond this season as he's not such a great 4th liner (especially in the last couple of months) that he should be taking up a spot over some of our good young forwards IMO. This is under the assumption Anaheim finds a coach who actually realises a 4th line is more then a 5 minute a night grinder's line.
Hopefully Wagner's budgeted salary goes to Grant, then the likes of Terry(hopefully)/Kosilla/Jones/Kerdiles/Roy fight for the other spots on that 4th line. When you have a line like Cogs-Kesler-Silf (assuming Silf isn't traded) you don't need another defensive grinders line.