RSS will become a mainstream technology when it ceases to be RSS. In the same way that no one prompts browsers to view HTML, those wishing to push RSS adoption have to get beyond the acronym and focus on what the technology is doing. Some of this is already happening with the concept of Feeds, but it really has to go further in mom-friendliness to see widespread adoption. A button on the web browser that detected an RSS feed when you visited a site and allowed you to simply subscribe to [site name] (free!) might go a long way toward making the technology unthreatening.