I'm not sure there's the absolutely massive untapped demand that is being suggested from hobbyists, though it is going to sell a lot to them (in the 10,000s, maybe more).
I picked up a BeagleBone[1] last week, made by Texas Instruments for £60, which has significantly more CPU power than the Raspberry, 256MB of RAM and has embedded Ethernet (so is more comparable to the $35 model).
So while D-Link and Netgear aren't exploring this area, TI definitely are, and are very much in a position to roll out millions of these devices if the demand is there.
However I think the Raspberry Pi exists in it's current form to drive demand for a bulk order from governments as an educational tool, and if someone ordered either the BeagleBone or Raspberry Pi for every 10 year old child then I think that would be a brilliant step.