That's something that should be pushed by the developer community, I think. Perhaps having an HTML client for people who nowadays use PDF writers and readers, with the option to tag data in some easily parseable format (if the data isn't already coming in a table).
This should output a single file and ideally it should have some way of ensuring the author it won't be modified unnoticed (that's one of the features common people use PDF for, today, they think it is something no one can modify) -- perhaps signing it with a key from Keybase would work in the mid term.
epub is html-based, and their standards body recently got absorbed by the W3C. I think it would be a fine replacement for some of the uses that PDF gets (such as distributing research papers). Unfortunately I don't see it happening any time soon, PDF is so ubiquitous right now and there's very few tools that let you "save to epub". Chicken & egg.
This should output a single file and ideally it should have some way of ensuring the author it won't be modified unnoticed (that's one of the features common people use PDF for, today, they think it is something no one can modify) -- perhaps signing it with a key from Keybase would work in the mid term.
https://github.com/iffy/lhtml has something going in this direction.