I think the pay-per-article model is still worse than a single flat fee. Because there's a marginal cost per article, each time you have an article link you have to ask yourself "do i definitely want to read this?" Even if there are refunds and stuff, this has a psychological cost. It makes sharing content harder too. It also might be weird to say even more directly that "this article produced exactly X dollars of profit," or "this journalist's articles produce X dollars of profit on average."

Also, one of the best things about the Internet & the ad model is that it made content available to everyone. Someone from a relatively poor background, or someone who's just strapped for cash at a certain time, will still have equal access to information.