Well, as I said before, I don't see cheap arduino boards flooding the market, as a result of production files beeing released. The arduino boards aren't expensive, I guess anyone knows that by now. Even the bluetooth board's pricing is fair (is there someone who found a single pice Bluegiga WT11 chip vendor selling not exclusively to business people?, I couldn't...).
I'm quite shure the arduino creators don't make much money out of selling the boards, just because there is not much room for profit. The very few people, trying to get some cheaper boards form china would shurly discover high shipping costs and other problems. At least as long as the demand for arduino boards is below typical consumer electronics distribution volumes... 
Also there are so many Arduino-like boards (I'm speaking of the ones with just an ATmega 8 chip), so no one can really speak about intellectual porperty, that has to be hidden for the sake of making profit.
For me it's more a question on principle.
As a community member, I'd just feel better if the hardware is handled like the very same as the software is.
Concerning the ardunio clone/alternative board builders (the ones created for use with the Arduino IDE), I can - at the moment - see reason for not publishing their complete cad files.
Why should they do it, if the core project has no clear opinion and is enventually not releasing all files?
Regards,
Oli
p.s. of cources I'm also a supporter of local production. I just say realeasing the files would most probably not hurt there.