What if you built an operating system around RSS?
FeedLand is going down this path.
Feeds are so easy to work with in FeedLand, I want to build all the features with RSS now.
BTW -- I am not leaving outliners and OPML behind.
There's a small feature tucked away in the Source namespace that allows an RSS item to be an outline.
A global network of outlines moving at the speed of RSS.