Design your own phone: the next big development in smart devices?

Back in January I posted (read it here) on the challenge facing Samsung Electronics and Korea's other smartphone manufacturers because of technology changes and China's manufacturing prowess.  Now that Google's Project Ara is up and running, I personally think that modular, "design your own" smartphones possibly represent the next big change in smart devices.
The new phones are certainly going to be price competitive.  As reported by The Chosun Ilbo, the basic kit developed under Project Ara will cost only about U.S. $50.  The basic idea behind Project Ara is that users will first select an endoskeleton frame, provided by Google, and can then choose their own modules for screen, memory, camera and the other components of the phone. (click on the accompanying graphic to see a full size version)  With the rapid spread of 3-d printers, it is not at all far fetched to assume that consumers will soon be printing some of the components themselves from downloaded software instructions for the printer.