It's very true that the underlying cost of the technology is falling. However, the cost of chip development is growing rapidly as device size falls (tapeout costs are >$1M USD today) and the market is somewhat limited, so the ability to amortize your design cost across volume is somewhat limited.

To further limit the market by effectively constraining it to your own internal consumption is going to further increase this effect.

Normally, when a device designer contracts out manufacturing of their design to the Asian factories, they constrain the factories to only produce devices for the designer themselves. If the designer of such comodity devices were to take an open-source approach, and allow the Asian factories to produce devices for anyone who wants them, then this constraint is removed. Of course, the price lowering still depends on lots of others adopting the same hardware so this only partially solves that problem. --Michael Dillon