GW's biggest threats are entry costs (putting of new gamers), going too far with their prices (putting of existing gamers), X wing, and putting all their eggs in one 40k basket. 3d printer will hurt them. But they will be used by some of the people who already torrent rule books and buy models from knock off companies and only some because these people want things cheap, which 3d printing isn't. I'm not sure I agree they will never be detailed and cheap. Technology leaps do happen. As someone who has ended up with non GW resin models, by mistake. I can say I'll be sticking with their products come 3d printing or high water. And moaning my head off if they do ever replace plastic with 3d printers.