Instead of spending their time gluing small plastic things together those artists can now use CAD and have a 3d printer to do grunt work. Less glamorous I suppose, but I think that 3d printers represent a far more modest change to them than CGI (how many physical models were created for the 3 most recent Star Wars films?).
But those same artists can now create a hundred or thousand individually different Wookies or Tie Fighters or many fully animated Na'avi [or Gungan].
The creativity is not lost - it's now massively leveraged.