Scaling to infinity isn't an issue per se since we aren't going to hand out weapons of infinite damage (at least in this expansion). It's cool if Dungeon Fighter Online Gold Necrosis and BCB favor DW. We don't think they will drive all DKs to be DW, at least with gear available in Lich King. It sounds like something didn't work right with the Killing Machine change, because the intent was to bring down the proc rate and make it more consistent between 2H and DW. We are investigating.