Not a chance that 3D printers will kill hands on, but it will help (eventually) make things a bit less expensive for those wanting it made that way. Too many people who want to make art do so with the intent of hands on. Also, Drax, as I understand it, inexpensive metal 3D will be a while coming as these machine aren't cost effective yet. I don't keep up on this much, so what I'm thinking may be a bit dated, but as I understand it, 3D metal printers are only utilized with commercial usage so far. Unless you're a multimillionaire and can't stand not having one to play with. 
Technology improving will only make it easier to translate your ideas and dreamed art into reality. Butthere will ALWAYS be craftsman in our midst.