As all the new revelations trickle out and are accepted as truth, Wikileaks could eventually release something horrifying that they make up, and present as a leaked fact. The Hillary campaign couldn’t disprove the leak, since she took the extraordinary steps of deleting and destroying the incriminating government documents and then sanitizing the file cabinet.
I do think Wikileaks is smart to keep everything straight so that they can maintain credibility. There is value in that.
On the other hand, Hillary has watched tens of thousands of emails get released and she has never said, "This stuff is all fakes and forgeries! I never sent those emails!" Because she has not protested any previous emails, if they did release a fake email from her to ISIS saying:
"If you give $10M to my foundation, I can have nuclear device available to you in Benghazi. All you have to do is storm the embassy, kill the ambassador, and steal the nuclear device. I can make this go smoothly for you if you deposit the $10M in my Swiss account, as usual."
Of course Hillary would declare this one a fake. But how many people would believe her?