The higher end specifications required to power Oculus will definitely be a stumbling block. Presumably the headset will cost more than the developer kits costs, then you need to throw in at least an additional $800 for a high-end graphics card to power the Oculus. This is the kind of money only hardcore gamers will warrant, not a small family with a few kids wanting to get them a Christmas present. I have always said Oculus need to partner with a graphics card company like AMD or Nvidia and give the headset away with a high-end graphics card purchase, or at least heavily subsidise it. They're killing two birds with one stone then.
Even if they fail now, when they make the product that is truly good, everyone will keep hearing that on the press and from friends.
With the recent bumps in the specs, I think it shows that you need more power than most people have available to get that kind of performance.