It might go beyond the ethos of HN, but I honestly wonder how much we should consider arguments like, "Normal people won't be able to use it" and "You won't be able to build a business on that because only a tiny fraction of people would want to use it". I often think about PGP/GPG (and especially web of trust) that way. I know it's useful to me and I know that the people I want to use it with are more than capable. But they decline.
RSS is an even better example. Why are we not building RSS tools? Why are we not building a brand around blog posts, FAQs, etc that contain RSS? Why is it not the "secret password" that opens the gate to the "good content that's not being gamed for the masses"?