Sometimes it's useful to revisit an idea and look at it with an open mind. The landscape has changed. Perhaps micropayments as they exist in 2011 are doomed to fail as well but I wouldn't jump to that conclusion based on a single 8 year old article.
The closest thing to micropayments that has had any success whatsoever have been pay-what-you-want like Radiohead's In Rainbows and the Humble Indie Bundles and even there they get most of their money from the small segment that pays a lot, effectively as a form of donation that subsidizes the people who wish to only pay $0.01(or in Radiohead's case $0)
I have come to my conclusion in 2011 the same way Clay Shirky did in 2003: the trails of dead micropayment services.
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.164...