It would be interesting if the article had more research on what the emotions of users when they come across a paywall. For example, I get irrationally upset when I see a paywall, even though I logically know that content writers deserve to be paid.
The fact that less than 20% of Americans will pay for news almost certainly makes the subscriptions more expensive for the percentage of users who will actually pay. Does the price affect how upset someone gets? I know for me, I don't even look at the price, I never intended on paying since I've been conditioned to expect articles to be free.