Hard to say, basically we have two precedents on how Gallant has managed center to wing moves.
1) Trocheck, who got bounced around from center to wing to center to wing depending on who was injured and slumping for a good 2 years until he solidified his spot as a center.
2) Bjugstad, who everyone has been begging to be tried at wing because his hockey IQ isn't that great for a center and he isn't much of a playmaker, but he's stuck as a center no matter what has happened. There's been times where he's played hurt and Gallant still didn't move him to wing.
My view is that since Malgin has been playing with another center (McCann), but Gallant hasn't switched them around even when the line was playing really poorly, it looks like Gallant wants Malgin to play center (or the other way around, wants McCann to play wing). Then when you consider in that Bjugstad hasn't played wing before, Malgin is probably the one headed to the AHL I think.