I'm not saying there isn't a business model for Poole's ideas, but execution will not be simple. Which shouldn't phase the HN crowd, as the rewards for doing it better and still meeting the needs of the users could be a large pay off.
This general "you're doing it wrong" thing reminds me of Jonathan Blow's comments on execution and Doom. It's easy to nitpick from afar, much hard to succeed. I know Poole has a successful community under his belt, but it's a community that's not exactly easy to generate a living from.