Console sales should be better than DAO imo, PC sales will probably be affected and most likely end up worse than DAO which had pretty good sales for a PC game, if i am not mistaken. I think this got more to do with that PC gamers are angry that we don't get the superior version this time and that it feels like a console port (although its not one), than the controversy though.
Some of the complains are baised though like; its easier and dumbed down. DAO was a relative auto pilot game to begin with this is just more of it. And nightmare is much harder than it was in the last game. Also some boss encounters you actually have to think. In DAO those encounters where only in Awakening and in that expansion your character was so level up, that the game was already easy anyway.