It has been discussed several times, and at length. Nothing ever resulted from it, but there would certainly have to be some restrictions. Having a publicly editable Wiki under the CF name could potentially land the site in hot water... so there's that giant liability lingering. With some access controls though, I don't think it'd be a terrible idea as I'm sure others would agree.
See CF wiki
EDIT: My personal thought on this is, sure why not? (granted there are controls), but it may also distract from the forums, or it may also add value. It's all speculation until the 'rubber meets the road,' that is to say; anyone can speculate any number of possible outcomes, but only testing it will show it's true effectiveness.
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?