I think he get the point wrong. Amazon is evil, but its evilness will NOT cause writers to disappear.
Writers always write. they did it for century even starving while doing it. So the argument to bash Amazon (or more effectively to boycott it) to keep good book around, is probably a false one. I think Amazon is doing what Walmart (and the like ) did to the small food retailer. On a bigger scale. Amazon is just plain killing any small distributor (and everyone is small compares to Amazon). And the sad news: There is no reason (other than morality, or fairness) to prevent them to do so. Writers will ever write even for pocket money. Consumers will get ultra cheap book. Like for the food industry, some product will disappear, but nobody really liked them anyway. Even if we have an Amazon 2 created by google or facebook, you'll just have 2 retailers to submit to instead of one. The problem is not the monopoly, it's that the final distributor always had, and will have, the power over the producer. I'm sad for writers. Not so sad for publishers -they had their fair time screwing authors-.