I recently was looking for Java based open sourced wiki software for intranets. And I read about this software called LifeRay. To most people on these forums, LifeRay is not particularly interesting (based on searching HN for LifeRay related submissions and seeing how many comments a submission gets). The market size for LifeRay might be quite large, I don't know, but it is just not the kind of tech that people are excited enough to comment about. For example, I am fairly sure no one is going to go and read about LifeRay just because they read this blurb.
There are many different reasons for the lack of excitement as I am sure you can imagine. But the echo chamber is not the cause of the lack of discussion. Some topics are not just interesting enough, and probably never will be.