Open source hardware totally makes sense in the hobbyist world. Its going like gangbusters at places like Adafruit, Sparkfun, etc.
Remains to be seen how well it works at the big corporate level, but I could see real benefit to putting an end to duplicative squandering of R&D resources by a hundred different companies on same, but different, designs for motherboards, power supplies, routers, etc.
I kind of doubt its going to help Cisco, HP or Dell though. Its just going to further commoditize hardware and cut profit margins. Once you have solid designs big data centers like Amazon, Google, Facebook and Rackspace will, if they haven't already, farm out the manufacturing to lowest bidder in China and cut out the middlemen which would be HP and Dell.
I really don't see what value HP and Dell add to anything at this point and their stock prices seem to concur. Microsoft and Linux own the software, and hardware just isn't a place to differentiate much any more except on the very high end. Apple was smart enough to hold on to the software, hardware and ecosystem and they are reaping huge profits as a result.
HP is especially sad. Apotheker knew their hardware business was going no where but down, his board apparently completely supported him in spinning it off, if it wasn't the boards idea in the first place. Leo announced it, stock tanked, media and social networks skewered them, and the board scapegoated Leo and claimed it was all his fault. Sad.
Another plus with open hardware, coupled with open software, is it might slow down the NSA, FBI and/or Huawei from backdooring all our computing and network infrastructure.