Firstly, as Doezaan suggests, the correct title for this short article would have been "The danger of DRM-protected ebooks".
This article says nothing new. I agree that from a practical point of view, the only viable method to reward book authors in the long-term is likely to be voluntary payments by readers.
We've all watched idealistic software authors make their software freely available, inviting voluntary donations. And then a 100,000 downloads later, they notice they've earned just enough to pay for the bandwidth used by the downloads.
So I am pessimistic. People's mindsets will have to change. Today, people don't think about the welfare of individual authors, or singers, or software writers. That's something they'll have to learn.
There are green shoots. I remember the author of Instapaper
inviting "subscriptions" to support the service, while offering nothing new in return. I think enough people signed up to give him some hope that voluntary donations could be part of a viable model (I signed up - Instapaper is a fantastic service, and I'd hate to see it disappear). But I'm pretty sure his paid-for apps are still the mainstay of his income. Most people only pay when they have to.
At the moment I'm in the "I don't like DRM on ebooks, but I don't see a viable economic alternative" camp. So despite having a Kindle, I still buy printed books. I only use the Kindle to read my Instapaper feeds, and other documents I email to the Kindle.