I think it would be particularly useful to include change history and discussion pages. The struggle of how we arrived at this apparent consensus, and the evidence that it was just a snapshot of a (mysteriously and suddenly stilled?) roiling river of debate, could be nearly as valuable as the facts themselves.
I doubt it. How important would the heavily debated subjects be to a post-apocalyptic society? I'd imagine they would care much more about husbandry, carpentry, metallurgy, and primitive industrial chemistry than whether or not X person was notable enough to deserve a page or precisely how long Colbert managed to keep the page about the extinct elephant altered.
Whilst I don't disagree with your point, I recall that for an enormously long time so much weight was put into the works of ancient Greeks that we literally missed the evidence of our own senses[1]. An understanding on the part of our hypothetical post-apocalypse recovery that the knowledge of their ancestors, whilst enormously useful, is not an absolute and is open to correction, would help them avoid making that mistake themselves. Sure, perhaps not the history of a page on something trivial, but something to keep the knowledge of the ancients being seen as immutable.
[1] The example I can't find, so I can't be sure I remember this correctly, but an ancient Greek writer described an insect as having a number of legs that it quite clearly didn't, and wasn't corrected for a long, long time.
