What does the future of 3D printing look like? How will it affect our lives and revolutionize the ways we think of the 'digital' world and the 'material' world? Why are so many people working on 3D printing?

What does the future of 3D printing look like? How will it affect our lives and revolutionize the ways we think of the 'digital' world and the 'material' world? Why are so many people working on 3D printing?

http://techtv.mit.edu/videos/23232-science-of-digital-fabrication-materials-and-mechanisms