Shaman becoming plate would be like a nightmare change for me, it's already hard enough finding decent mail pieces for my ideal shaman look that aren't straight up shaman tier items (I just want some more clothy or leathery tribal looking skirts please, not overly complex looking metal themed monstrosities). Cloth and leather are the only things that make sense, and since you can't mix and match both anymore I guess it would have to be cloth if hunter was going leather already since leather would then have 5 different classes using it. Obviously cloth wouldn't suit a hunter at all. But it probably makes more sense lorewise for shaman to be leather as well.