I would say many if not all ARPG fans already know Path of Exile, but those few Diablo believers will be converted I'm sure. It is insane how GGG managed to steal the whole gaming genre that once belonged to blizzard alone and blizzard just allowed it, and I don't think blizz has what it takes to take the throne back. Let the ARPG wars begin, it will be interesting to watch :)