Zarhym hit the forums today to reveal details on a hotfix to Chaos Orbs. For those of you who have been burned by players rolling need on them, even if they can't do anything with the item, something has finally been done to alleviate it. Unfortunately there's nothing Blizzard can do for orbs already rolled on, but from here out you will no longer be able to roll need on a Chaos Orb unless you have a skill level of 425 or higher in Blacksmithing, Engineering, Leatherworking or Tailoring.
For anyone who doesn't have a profession listed above at the appropriate skill level, you'll have to settle on rolling greed from here out. The larger question of "why aren't these Bind on Equip" seems to have been answered for now. Blizzard wants them to be something useful to those who can craft epic items from them, and nothing more. It's entirely possible we'll see a change in 4.1, though, once a new tier of epics are introduced.
And while he says in his original reply that it may require realm restarts, he popped back in to let everyone know that it looks like this is live now.