The sales of computers are going down last years, and there are more other devices in the age of "Internet of Things" that are harmful for the freedom of the users. Even simple climate control is not your device, but is designed to spy on your family habits, "phone home" - all in the name of optimizing your utility bills. In the US the practical disadvantage of this unfreedom can likely be just unsolicited junk mail, in other countries with higher corruption levels this data can be sold to burglars who will visit your home when the heating/AC is set on "vacation" level. Freedom of the users of the devices (including all 4 classic components) is much broader then just that of the computer operators, and the choice if free/non-free is not only about your philosophy, but be a matter of survival.
As for Richard Stallman - I just can not see, where is that his one mistake. For years there are continuing attempts by others to create "hardware GPL" but there is no universal solution (we use exactly the combination mentioned in the article: GPLv3 for software/firmware/FPGA and CERN OHL for the hardware) caused by fundamental differences of the software and hardware. His last year article http://www.wired.com/2015/03/r... provides a lot of practical instructions how to build free hardware in a not-yet-so-free hardware world, there are "levels of design".