that may not be entirely true; if you imagined a universe where xanadu exists, and was popular as a general tool, then you can envision that open-source primary

that may not be entirely true; if you imagined a universe where xanadu exists, and was popular as a general tool, then you can envision that open-source primary documents would be preferred over closed, simply on the basis that you can actually consistently link to them (in the same fashion that, today, non-paywalled sites are naturally favored over paywall for sharing on HN). And if xanadu documents were more useful (because of their interlinking and history) than the close-able flat documents (or perhaps closed documents that only link to closed source), then naturally things would slowly trend towards open documents by default, as it becomes more difficult to constrain yourself to the closed-source world. The problem today might be then, that everyone already accepts that primary documents are likely to be sealed off, and there's no significant incentive otherwise. But if the idea of having a sufficiently useful document upgraded from a flat pdf to a historically-archiving xanadu document...