Using A 3D Printer to Build A Home

I found this video on an article on news.cnet.com. Basically the video is about a large 3D printer that would be capable of building a +/- 2,500sf semi-customizable home in 20 HOURS!!! How crazy is that? You would still need heavy machinery and constructions professionals to assist the printer. Technology continues to amaze me. I wonder how soon we will see this come into play?

What do you think about this idea?

Link to full article is below:
http://news.cnet.com/8301-11386_3-57617637-76/is-3d-printing-the-future-of-home-building/?ttag=fbwl