History is written by the victors. If, in 100 years, Assange is on the side of the next world power (e.g. not the United States) he'll be hagiographized.
If, on the other hand, he dies like a dog in a ditch and America returns as a world super power 100 years from now, he'll be a footnote to all but likeminded hackers.
One thing is sure either way, though, Wikileaks will fundamentally change the way we gather, disseminate and allow intelligence collectors to interact with one another here in the States.