Subtle point, but your assumption (nearly everywhere else in this discussion as well) relies on paying for content before you've consumed it. I haven't heard much discussion on what happens if you remove that assumption.

If you could attach a frictionless transaction to a "Like" or "Kudos", I would be happy to pay $1 a pop or something reasonable for a well researched blog post after I've read it. Maybe not feasible for a wider public, but certainly might have niche acceptance.